An overview of the first 5 years of the ENIGMA obsessive-compulsive disorder working group : The power of worldwide collaboration - van den Heuvel, Odile A. (Haukeland University Hospital (Bergen, Noruega)) ; Boedhoe, Premika (Vrije Universiteit Amsterdam) ; Bertolín, Sara (Institut d'Investigació Biomèdica de Bellvitge) ; Bruin, Willem Benjamin (University of Amsterdam) ; Francks, Clyde (Radboud University) ; Ivanov, Iliyan (Icahn School of Medicine at Mount Sinai) ; Jahanshad, Neda (Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & Informatics) ; Kong, Xiang-Zhen (Max Planck Institute for Psycholinguistics) ; Kwon, Jun Soo (Seoul National University College of Natural Sciences) ; O'Neill, Joseph (UCLA Jane & Terry Semel Institute For Neuroscience) ; Paus, Tomas (Bloorview Research Institute) ; Patel, Yash (Bloorview Research Institute) ; Piras, Fabrizio (IRCCS Santa Lucia Foundation) ; Schmaal, Lianne (The University of Melbourne. Centre for Youth Mental Health) ; Soriano-Mas, Carles (Universitat Autònoma de Barcelona) ; Spalletta, Gianfranco (Baylor College of Medicine) ; van Wingen, Guido A. (University of Amsterdam) ; Yun, Je-Yeon (Seoul National University College of Medicine) ; Vriend, Chris (Vrije Universiteit Amsterdam) ; Simpson, H. Blair (Institute and Columbia University Irving Medical Center. Center for OC and Related Disorders at the New York State Psychiatric) ; van Rooij, Daan (Radboud University) ; Hoexter, Marcelo Q. (Universidade de São Paulo) ; Hoogman, Martine (Radboud University Medical Center) ; Buitelaar, Jan (Radboud University) ; Arnold, Paul D (University of Calgary. Cumming School of Medicine) ; Beucke, Jan C. (Department of Clinical Neuroscience) ; Benedetti, Francesco (Scientific Institute Ospedale) ; Bollettini, Irene (Scientific Institute Ospedale San Raffaele) ; Bose, Anushree (National Institute of Mental Health and Neurosciences) ; Brennan, Brian P. (Harvard Medical School) ; De Nadai, Alessandro S. (Texas State University) ; Fitzgerald, Kate (University of Michigan Medical School) ; Gruner, Patricia (Yale University) ; Grünblatt, Edna (University of Zurich) ; Hirano, Yoshiyuki (Chiba University) ; Huyser, Chaim (De Bascule) ; James, Anthony (University of Oxford) ; Koch, Kathrin (Technical University of Munich. Klinikum Rechts der Isar) ; Kvale, Gerd (Haukeland University Hospital (Bergen, Noruega)) ; Lázaro, Luisa (Institut d'Investigacions Biomèdiques August Pi i Sunyer) ; Lochner, Christine (Stellenbosch University) ; Marsh, Rachel (Columbia University Irving Medical Center. Center for OC and Related Disorders at the New York State Psychiatric Institute) ; Mataix-Cols, David (Scientific Institute Ospedale) ; Morgado, Pedro (Clinical Academic Center-Braga) ; Nakamae, Takashi (Kyoto Prefectural University of Medicine. Graduate School of Medical Science) ; Nakao, Tomohiro (Kyushu University) ; Narayanaswamy, Janardhanan C. (National Institute of Mental Health and Neurosciences) ; Nurmi, Erika (University of California) ; Pittenger, Christopher (Yale University) ; Reddy, Y. C. Janardhan (Department of Clinical Neuroscience) ; Sato, João R. (Universidade Federal do ABC (Brasil)) ; Soreni, Noam (McMaster University (Canadà)) ; Stewart, S. Evelyn (BC Children's Hospital) ; Taylor, Stephan F. (University of Michigan Medical School) ; Tolin, David (The Institute of Living. Anxiety Disorders Center) ; Thomopoulos, Sophia I. (Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & Informatics) ; Veltman, Dick J. (Vrije Universiteit Amsterdam) ; Venkatasubramanian, Ganesan (National Institute of Mental Health and Neurosciences) ; Walitza, Susanne (University of Michigan Medical School) ; Wang, Zhen (Shanghai Jiao Tong University. Institute of Psychological and Behavioral Science) ; Thompson, Paul M. (Imaging Genetics Center, Mark & Mary Stevens Institute for Neuroimaging & Informatics) ; Stein, Dan J. (University of Cape Town)