Papers

Here is a list of papers that I have written or co-authored. If you need the PDF of one of these publications, feel free to contact me.

Books · Packages · Workshops · News

2024

• Harrer, Mathias, Nixon, Patricia, Sprenger, Antonia A., Heber, Elena, Boß, Leif, Heckendorf, Hanna, Buntrock, Claudia, Ebert, David Daniel and Lehr, Dirk, Are web-based stress management interventions effective as an indirect treatment for depression? an individual participant data meta-analysis of six randomised trials^*, BMJ Mental Health 27, 2024 [html] [doi]
• Buntrock, Claudia, Harrer, Mathias, Sprenger, Antonia A, Illing, Susan, Sakata, Masatsugu, Furukawa, Toshi A, Ebert, David D, Cuijpers, Pim, Adriaanse, Marcel C, Albert, Steven M, Allart, Esther, Almeida, Osvaldo P, Basanovic, Julian, Batterham, Philip J, Baumeister, Harald, Berger, Thomas, Blanco, Vanessa, Casten, Robin, Chan, Dicken, Christensen, Helen, Ciharova, Marketa, Cook, Lorna, Dobson, Keith S, Dozeman, Elsien, Imamura, Kotaro, Irwin, Michael R, Kawakami, Norito, Karyotaki, Eirini, Klein, Jan P, Konnert, Candace, Lara, María A, Le, Huynh-Nhu, Lehr, Dirk, Moritz, Steffen, Muñoz, Ricardo F, Olmstead, Richard, Otero, Patricia, Reynolds III, Charles F, Rovner, Barry W, Sander, Lasse B, Smit, Filip, Spinhoven, Philip, Stelmach, Liza, Terhorst, Yannik, Vázquez, Fernando L, Watkins, Ed, Willemse, Godelief RWM, Yang, Wenhui and Wong, Samuel YS, Psychological interventions to prevent the onset of major depression in adults: a systematic review and individual participant data meta-analysis, The Lancet Psychiatry 11, 990-1001, 2024 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Harrer, Mathias, Ciharova, Marketa and Karyotaki, Eirini, The overestimation of the effect sizes of psychotherapies for depression in waitlist controlled trials: a meta-analytic comparison with usual care controlled trials, Epidemiology and Psychiatric Sciences 33, e56, 2024 [html] [doi]
• Fuhrmann, Lukas M., Weisel, Kiona K., Harrer, Mathias, Kulke, Jennifer K., Baumeister, Harald, Cuijpers, Pim, Ebert, David D. and Berking, Matthias, Additive effects of adjunctive app-based interventions for mental disorders - a systematic review and meta-analysis of randomised controlled trials, Internet Interventions 35, 100703, 2024 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Ciharova, Marketa, Harrer, Mathias and Karyotaki, Eirini, Non-directive supportive therapy for depression: a meta-analytic review, Journal of Affective Disorders, 2024 [html] [doi]
• Miguel, Clara, Cecconi, Jessica, Harrer, Mathias, van Ballegooijen, Wouter, Bhattacharya, Shalini, Karyotaki, Eirini, Cuijpers, Pim, Gentili, Claudio and Cristea, Ioana A, Assessment of suicidality in trials of psychological interventions for depression: a meta-analysis, The Lancet Psychiatry, 2024 [html] [doi]
• Schulte, Christina, Harrer, Mathias, Sachser, Cedric, Weiss, Jasmina and Zarski, Anna-Carlotta, Internet- and mobile-based psychological interventions for post-traumatic stress symptoms in youth: a systematic review and meta-analysis, npj Digital Medicine 7, 2024 [html] [doi]
• Thielecke, Janika, Kuper, Paula, Lehr, Dirk, Schuurmans, Lea, Harrer, Mathias, Ebert, David D., Cuijpers, Pim, Behrendt, Dörte, Brückner, Hanna, Horvath, Hanne and et al, Who benefits from indirect prevention and treatment of depression using an online intervention for insomnia? results from an individual-participant data meta-analysis, Psychological Medicine, 1–14, 2024 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Harrer, Mathias, Ciharova, Marketa and Karyotaki, Eirini, The outcomes of mental health care for depression over time: a meta-regression analysis of response rates in usual care, Journal of Affective Disorders 358, 89-96, 2024 [html] [doi]
• Cuijpers, Pim, Harrer, Mathias, Miguel, Clara, Keshen, Aaron, Karyotaki, Eirini and Linardon, Jake, Absolute and relative outcomes of cognitive behavior therapy for eating disorders in adults: a meta-analysis, Eating Disorders, 1-22, 2024 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Ciharova, Marketa, Harrer, Mathias, Basic, Djordje, Cristea, Ioana A., de Ponti, Nino, Driessen, Ellen, Hamblen, Jessica, Larsen, Sadie E., Matbouriahi, Minoo, Papola, Davide, Pauley, Darin, Plessen, Constantin, Pfund, Rory, Setkowski, Kim, Schnurr, Paula P., van Ballegooijen, Wouter, Wang, Yingying, Riper, Heleen, van Straten, Annemieke and Sijbrandij, Marit, Furukawa, Toshi A and Karyotaki, Eirini, Absolute and relative outcomes of psychotherapies for eight mental disorders: a systematic review and meta-analysis, World Psychiatry 23, 267-275, 2024 [html] [doi]
• van Ballegooijen, Wouter, Rawee, Josine, Palantza, Christina, Miguel, Clara, Harrer, Mathias, Cristea, Ioana, de Winter, Remco, Gilissen, Renske, Eikelenboom, Merijn, Beekman, Aartjan and Cuijpers, Pim, Suicidal ideation and suicide attempts after direct or indirect psychotherapy: a systematic review and meta-analysis, JAMA Psychiatry 9, 2024 [html] [doi]
• de Ponti, Nino, Matbouriahi, Minoo, Franco, Pamela, Harrer, Mathias, Miguel, Clara, Papola, Davide, Sicimoğlu, Ayşesu, Cuijpers, Pim and Karyotaki, Eirini, The efficacy of psychotherapy for social anxiety disorder, a systematic review and meta-analysis, Journal of Anxiety Disorders, 102881, 2024 [html] [doi]
• Feber, Lena, Salanti, Georgia, Harrer, Mathias, Salahuddin, Nurul H., Hansen, Wulf-Peter, Priller, Josef, Bighelli, Irene and Leucht, Stefan, Psychological interventions for early-phase schizophrenia: protocol for a systematic review and network meta-analysis, F1000Research 13, 2024 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Harrer, Mathias, Ebert, David D. and Karyotaki, Eirini, Interpersonal psychotherapy for depression in low- and middle-income countries: a meta-analysis, in: Interpersonal Psychotherapy: A Global Reach, Oxford University Press, 2024. ISBN 978-0-19-765208-4 [html] [doi]

2023

• Harrer, Mathias, Baumeister, Harald, Cuijpers, Pim, Heber, Elena, Lehr, Dirk, Kessler, Ronald C. and Ebert, David Daniel, Predicting effects of a digital stress intervention for patients with depressive symptoms: development and validation of meta-analytic prognostic models using individual participant data, Journal of Consulting and Clinical Psychology, 2023 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Ciharova, Marketa, Ebert, David, Harrer, Mathias and Karyotaki, Eirini, Transdiagnostic treatment of depression and anxiety: a meta-analysis, Psychological Medicine, 1-12, 2023 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Harrer, Mathias, Plessen, Constantin Yves, Ciharova, Marketa, Ebert, David and Karyotaki, Eirini, Cognitive behavior therapy vs. control conditions, other psychotherapies, pharmacotherapies and combined treatment for depression: a comprehensive meta-analysis including 409 trials with 52,702 patients, World Psychiatry 22, 105-115, 2023 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Ciharova, Marketa, Quero, Soledad, Plessen, Constantin Yves, Ebert, David, Harrer, Mathias, van Straten, Annemieke and Karyotaki, Eirini, Psychological treatment of depression with other comorbid mental disorders: systematic review and meta-analysis, Cognitive Behaviour Therapy, 1-23, 2023 [html] [doi]
• Augustin, Michaela, Licata-Dandel, Maria, Breeman, Linda D, Harrer, Mathias, Bilgin, Ayten, Wolke, Dieter, Mall, Volker, Ziegler, Margret, Ebert, David Daniel and Friedmann, Anna, Effects of a mobile-based intervention for parents of children with crying, sleeping, and feeding problems: randomized controlled trial, JMIR mHealth and uHealth 11, e41804, 2023 [html] [doi]
• Zarski, Anna-Carlotta, Harrer, Mathias, Kuper, Paula, Sprenger, Antonia A, Berking, Matthias and Ebert, David Daniel, Predicting individualized effects of internet-based treatment for genito-pelvic pain/penetration disorder: development and internal validation of a multivariable decision tree model, arXiv preprint arXiv:2303.08732, 2023 [html] [doi]
• Harrer, Mathias, Terhorst, Yannik, Baumeister, Harald and Ebert, David Daniel, Digital phenotyping and artificial intelligence, Digitale Gesundheitsinterventionen: Anwendungen in Therapie und Praevention, 465-479, 2023 [html] [doi]
• Cuijpers, Pim, Karyotaki, Eirini, Harrer, Mathias and Stikkelbroek, Yvonne, Individual behavioral activation in the treatment of depression: a meta analysis, Psychotherapy Research, 1-12, 2023 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Harrer, Mathias, Plessen, C Yves, Ciharova, Marketa, Papola, Davide, Ebert, David and Karyotaki, Eirini, Psychological treatment of depression: a systematic overview of a meta-analytic research domain, Journal of Affective Disorders 335, 141-151, 2023 [html] [doi]
• Harrer, Mathias, Ebert, David Daniel, Kuper, Paula, Paganini, Sarah, Schlicker, Sandra, Terhorst, Yannik, Reuter, Benedikt, Sander, Lasse B and Baumeister, Harald, Predicting heterogeneous treatment effects of an internet-based depression intervention for patients with chronic back pain: secondary analysis of two randomized controlled trials, Internet Interventions 33, 100634, 2023 [html] [doi]
• Schoenenberg, Katrin, Bosbach, Katharina, Baumeister, Harald, Küchler, Ann-Marie, Hartmann, Andrea Sabrina, Harrer, Mathias, Ebert, David Daniel and Martin, Alexandra, Internet-based treatment of body dysmorphic disorder: feasibility, evaluation, and self-report data, The Journal of Nervous and Mental Disease, 2023 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Ciharova, Marketa, Harrer, Mathias, Moir, Fiona, Roskvist, Rachel, Straten, Annemieke van, Karyotaki, Eirini and Arroll, Bruce, Psychological treatment of adult depression in primary care compared with outpatient mental health care: a meta-analysis, Journal of Affective Disorders, 2023 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Harrer, Mathias, Ciharova, Marketa and Karyotaki, Eirini, Does the use of pharmacotherapy interact with the effects of psychotherapy? a meta-analytic review, European Psychiatry, 2023 [html] [doi]
• Harrer, Mathias, Cuijpers, Pim, Schuurmans, Lea KJ, Kaiser, Tim, Buntrock, Claudia, van Straten, Annemieke and Ebert, David, Evaluation of randomized controlled trials: a primer and tutorial for mental health researchers^*, Trials 24, 562, 2023 [html] [doi]
• Papola, Davide, Miguel, Clara, Mazzaglia, Mariacristina, Franco, Pamela, Tedeschi, Federico, Romero, Sara A., Patel, Anushka R., Ostuzzi, Giovanni, Gastaldon, Chiara, Karyotaki, Eirini, Harrer, Mathias, Purgato, Marianna, Sijbrandij, Marit, Patel, Vikram, Furukawa, Toshi A., Cuijpers, Pim and Barbui, Corrado, Psychotherapies for generalized anxiety disorder in adults: a systematic review and network meta-analysis of randomized clinical trials, JAMA Psychiatry, 2023 [html] [doi]
• Cuijpers, Pim, Harrer, Mathias, Miguel, Clara, Ciharova, Marketa and Karyotaki, Eirini, Five decades of research on psychological treatments of depression: a historical and meta-analytic overview, American Psychologist, 2023 [html] [doi]

2022

• Cuijpers, Pim, Ciharova, Marketa, Quero, Soledad, Miguel, Clara, Driessen, Ellen, Harrer, Mathias, Purgato, Marianna, Ebert, David and Karyotaki, Eirini, The contribution of “individual participant data” meta-analyses of psychotherapies for depression to the development of personalized treatments: a systematic review, Journal of personalized medicine 12, 93, 2022 [html] [doi]
• Kathan, Alexander, Triantafyllopoulos, Andreas, He, Xiangheng, Milling, Manuel, Yan, Tianhao, Rajamani, Srividya Tirunellai, Kuster, Ludwig, Harrer, Mathias, Heber, Elena, Grossmann, Inga and others, Journaling data for daily phq-2 depression prediction and forecasting, 2022 44th Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC), 2627-2630, 2022 [html] [doi]
• He, Xiangheng, Triantafyllopoulos, Andreas, Kathan, Alexander, Milling, Manuel, Yan, Tianhao, Rajamani, Srividya Tirunellai, Kuster, Ludwig, Harrer, Mathias, Heber, Elena, Grossmann, Inga and others, Depression diagnosis and forecast based on mobile phone sensor data, 2022 44th Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC), 4679-4682, 2022 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Papola, Davide, Harrer, Mathias and Karyotaki, Eirini, From living systematic reviews to meta-analytical research domains, BMJ Ment Health 25, 145-147, 2022 [html] [doi]
• Harrer, Mathias, Kathan, Alexander, Kuster, Ludwig, Triantafyllopoulos, Andreas, He, Xiangheng, Milling, Manuel, Gerczuk, Maurice, Yan, Tianhao, Rajamani, Srividya Tirunellai, Heber, Elena and others, Personalised depression forecasting using mobile sensor data and ecological momentary assessment^*, Frontiers in Digital Health, 2022 [html] [doi]

2021

• Reins, Jo Annika, Buntrock, Claudia, Zimmermann, Johannes, Grund, Simon, Harrer, Mathias, Lehr, Dirk, Baumeister, Harald, Weisel, Kiona, Domhardt, Matthias, Imamura, Kotaro and others, Efficacy and moderators of internet-based interventions in adults with subthreshold depression: an individual participant data meta-analysis of randomized controlled trials, Psychotherapy and Psychosomatics 90, 94-106, 2021 [html] [doi]
• Breedvelt, Josefien Johanna Froukje, Brouwer, Maria Elisabeth, Harrer, Mathias, Semkovska, Maria, Ebert, David Daniel, Cuijpers, Pim and Bockting, Claudi Louisa Hermina, Psychological interventions as an alternative and add-on to antidepressant medication to prevent depressive relapse: systematic review and meta-analysis, The British Journal of Psychiatry 219, 538-545, 2021 [html] [doi]
• Harrer, Mathias, Apolinario-Hagen, Jennifer, Fritsche, Lara, Salewski, Christel, Zarski, Anna-Carlotta, Lehr, Dirk, Baumeister, Harald, Cuijpers, Pim and Ebert, David Daniel, Effect of an internet-and app-based stress intervention compared to online psychoeducation in university students with depressive symptoms: results of a randomized controlled trial, Internet interventions 24, 100374, 2021 [html] [doi]
• Cuijpers, Pim, Ciharova, Marketa, Miguel, Clara, Harrer, Mathias, Ebert, David D, Brakemeier, Eva-Lotta and Karyotaki, Eirini, Psychological treatment of depression in institutional settings: a meta-analytic review, Journal of Affective Disorders 286, 340-350, 2021 [html] [doi]
• Apolinario-Hagen, Jennifer, Harrer, Mathias, Dederichs, Melina, Fritsche, Lara, Wopperer, Jeannette, Wals, Frank, Loerbroks, Adrian, Lehr, Dirk, Salewski, Christel, Angerer, Peter and others, Exploring the influence of testimonial source on attitudes towards e-mental health interventions among university students: four-group randomized controlled trial, PloS one 16, e0252012, 2021 [html] [doi]
• Harrer, Mathias, Baumeister, Harald, Kaehlke, Fanny, Franke, Marvin, Kuechler, Ann-Marie and Ebert, David Daniel, Studicare-results of randomized-controlled trials evaluating online interventions delivered at german-speaking universities as part of the who-wmh international college student initiative, International Journal of Behavioral Medicine, 2021 [html]
• Apolinario-Hagen, Jennifer, Fritsche, Lara, Wopperer, Jeannette, Wals, Frank, Harrer, Mathias, Lehr, Dirk, Ebert, David D and Salewski, Christel, Investigating the persuasive effects of testimonials on the acceptance of digital stress management trainings among university students and underlying mechanisms: a randomized controlled trial, Frontiers in psychology 12, 738950, 2021 [html] [doi]
• Cuijpers, Pim, Miguel, Clara, Ciharova, Marketa, Aalten, Pauline, Batelaan, Neeltje, Salemink, Elske, Spinhoven, Philip, Struijs, Sascha, de Wit, Leonore, Gentili, Claudio, ... Harrer, Mathias and others, Prevention and treatment of mental health and psychosocial problems in college students: an umbrella review of meta-analyses., Clinical Psychology: Science and Practice 28, 229, 2021 [html] [doi]

2020

• Harrer, Mathias, Adam, Sophia H, Messner, Eva-Maria, Baumeister, Harald, Cuijpers, Pim, Bruffaerts, Ronny, Auerbach, Randy P, Kessler, Ronald C, Jacobi, Corinna, Taylor, Craig Barr and others, Prevention of eating disorders at universities: a systematic review and meta-analysis, International Journal of Eating Disorders 53, 813-833, 2020 [html] [doi]

2019

• Harrer, Mathias, Adam, Sophia H, Baumeister, Harald, Cuijpers, Pim, Karyotaki, Eirini, Auerbach, Randy P, Kessler, Ronald C, Bruffaerts, Ronny, Berking, Matthias and Ebert, David D, Internet interventions for mental health in university students: a systematic review and meta-analysis, International journal of methods in psychiatric research 28, e1759, 2019 [html] [doi]
• Breedvelt, Josefien JF, Amanvermez, Yagmur, Harrer, Mathias, Karyotaki, Eirini, Gilbody, Simon, Bockting, Claudi LH, Cuijpers, Pim and Ebert, David D, The effects of meditation, yoga, and mindfulness on depression, anxiety, and stress in tertiary education students: a meta-analysis, Frontiers in psychiatry 10, 193, 2019 [html] [doi]
• Harrer, Mathias, Apolinario-Hagen, Jennifer, Fritsche, Lara, Druege, Marie, Krings, Ludwig, Beck, Korinna, Salewski, Christel, Zarski, Anna-Carlotta, Lehr, Dirk, Baumeister, Harald and others, Internet-and app-based stress intervention for distance-learning students with depressive symptoms: protocol of a randomized controlled trial, Frontiers in Psychiatry 10, 361, 2019 [html] [doi]
• Ebert, David Daniel, Harrer, Mathias, Apolinario-Hagen, Jennifer and Baumeister, Harald, Digital interventions for mental disorders: key features, efficacy, and potential for artificial intelligence applications, Frontiers in Psychiatry: Artificial Intelligence, Precision Medicine, and Other Paradigm Shifts, 583-627, 2019 [html] [doi]

2018

• Apolinario-Hagen, Jennifer, Harrer, Mathias, Kaehlke, Fanny, Fritsche, Lara, Salewski, Christel, Ebert, David Daniel and others, Public attitudes toward guided internet-based therapies: web-based survey study, JMIR mental health 5, e10735, 2018 [html] [doi]
• Fleischmann, Rebecca J, Harrer, Mathias, Zarski, A-C, Baumeister, Harald, Lehr, Dirk and Ebert, David Daniel, Patients' experiences in a guided internet-and app-based stress intervention for college students: a qualitative study, Internet Interventions 12, 130-140, 2018 [html] [doi]
• Harrer, Mathias, Adam, Sophia Helen, Fleischmann, Rebecca Jessica, Baumeister, Harald, Auerbach, Randy, Bruffaerts, Ronny, Cuijpers, Pim, Kessler, Ronald C, Berking, Matthias, Lehr, Dirk and others, Effectiveness of an internet-and app-based intervention for college students with elevated stress: randomized controlled trial, Journal of medical Internet research 20, e136, 2018 [html] [doi]

Workshops & Seminars

• Harrer, Mathias (2022). Introduction to Meta-Analytic Psychotherapy Research. Course with Online Learning Material. [html] [doi]
• Harrer, Mathias, Thielecke, Janika, & Sprenger, Antonia A. (2022). Evaluation Randomisiert-Kontrollierter Studien und Experimente mit R. Online-Workshop. [html] [doi]
• Harrer, Mathias, Maas genannt Bermpohl, Frederic, Kip, Ahlke & Hoppen, Thole (2024). Introduction to Meta-Analytic Psychotherapy Research [German]. Workshop at the 3^rd German Psychotherapy Congress. [html]

Books

• Harrer, Mathias, Cuijpers, Pim, Furukawa, Toshi A., & Ebert, David D. (2021). Doing Meta-Analysis with R: A Hands-On Guide. Boca Raton, FL and London: Chapman & Hall/CRC Press. ISBN 978-0-367-61007-4. [html]
• Harrer, Mathias, Cuijpers, Pim, Schuurmans, Lea KJ, Kaiser, Tim, Buntrock, Claudia, van Straten, Annemieke and Ebert, David (2023). Evaluation of Randomized Trials With R: A Tutorial for Mental Health Researchers. [html]

Packages & Software

• Harrer, Mathias, Cuijpers, Pim, Furukawa, Toshi A., & Ebert, David D. (2019). dmetar: Companion R Package For The Guide 'Doing Meta-Analysis in R. [html]
• Harrer, Mathias, Kuper, Paula, Sprenger, Antonia A., & Cuijpers, P. (2022). metapsyTools: Several R Helper Functions For The "Metapsy" Database. [html]
• Harrer, Mathias, Kuper, Paula, Sprenger, Antonia A., Karyotaki, Eirini & Cuijpers, P. (2022). metapsyData: Access the Meta-Analytic Psychotherapy Databases in R. [html]

Newspaper Reporting

• Can I prevent a depression? [German]. Der Spiegel, 2025 [html]
• Early therapies protect against depression. TUM Press Release, 2025 [html]
• How stress management can help against depression [German]. Deutschlandfunk Nova, 2024 [html] [audio]
• Stress management course helps against depression [German]. Spektrum der Wissenschaft, 2024 [html]
• CBT Should Be A First-Line Treatment for Generalized Anxiety Disorder. HCP Live, 2023 [html]
• CBT Best for Initial Treatment of Generalized Anxiety Disorder. Medpage Today, 2023 [html]
• Major Meta-Analysis Finds CBT Effective But Not Superior. Psychology Today, 2023 [html]