N.A.F. declares that in the past 3 years, she had held research or networking grants from the ECNP, UK NIHR, EU H2020, MRC, University of Hertfordshire. In the past 3 years, she had either accepted travel or hospitality expenses or both from the BAP, ECNP, RCPsych, CINP, International Forum of Mood and Anxiety Disorders, World Psychiatric Association and Indian Association for Biological Psychiatry. In the past 3 years, she had received payment from Taylor and Francis and Elsevier for editorial duties. In the past 3 years, she had accepted a paid speaking engagement in a webinar sponsored by Abbott. Previously, she had accepted paid speaking engagements in various industry supported symposia and have recruited patients for various industry-sponsored studies in the field of OCD treatment. She leads an NHS treatment service for OCD. She holds Board membership for various registered charities linked to OCD. She gives expert advice on psychopharmacology to the UK MHRA and NICE. S.W. has received royalties from Thieme, Hogrefe, Kohlhammer, Springer, Beltz in the last 5 years. Her work was supported by the Swiss National Science Foundation (SNF), diff. EU FP7s, HSM Hochspezialisierte Medizin of the Kanton Zurich, Switzerland, Bfarm Germany, ZInEP, Hartmann Müller Stiftung, Olga Mayenfisch, Gertrud Thalmann and Vontobel Fonds in the last 5 years. She received no honoraria from pharmaceutical or other industrial companies in the last 36 months. Outside professional activities and interests are declared under the link of the University of Zurich, https://www.uzh.ch/prof/ssl-dir/interessenbindungen/client/web. V.B. has received lecture honoraria from Lundbeck and Otsuka. V.B. is a clinical investigator in a clinical trial funded by Boeringher Ingelheim and has obtained competitive grant funding from a Pfizer Neuroscience Grant, the Nepean Medical Research Foundation, the University of Sydney, Western Sydney University, Western Sydney Local Health District and the Better Foundation. C.I.R. has served as a consultant for Allergan, BlackThorn Therapeutics, Rugen Therapeutics and Epiodyne, receives research grant support from Biohaven Inc. and a stipend from APA Publishing for her role as Deputy Editor at The American Journal of Psychiatry. J.M.M. has received honoraria and travel grants from Exeltis, Janssen, Servier, AbBiotics and Medtronic in the last 36 months. B.M.D. has received lecture honoraria from Lundbeck, Angelini, Janssen, Neuraxpharma, Arcapharma and Livanova. Y.C.J.R. has received grants from the Department of Biotechnology (DBT) and the Indian Council of Medical Research (ICMR) of the Government of India and is currently involved in a study funded by the National Institute of Mental Health (NIMH), USA. Y.C.J.R. is the lead author of the Indian Psychiatric Society (IPS) Clinical Practice Guidelines for Obsessive-Compulsive Disorder and is also the lead author of the Clinical Practice Guidelines for Cognitive Behaviour Therapies in Anxiety Disorders and Obsessive-Compulsive Related Disorders (in press). D.J.S. has received either research grants or consultancy honoraria from Lundbeck and Sun or both. S.P. declares funding from the National Institute of Mental Health, USA; R21 NCTID NCT03669315. J.Z. received grants and research support from Lundbeck, Servier, Brainsway, Pfizer and the DOD, honoraria and consultation fees from Lundbeck, Roche, Lilly, Servier, Pfizer. S.R.C. consults for Promentis and Ieso Digital Health. S.S.A. has received research funding grant from the Wellcome Trust-DBT India alliance and Indian Council of Medical Research. M.V.A. reports being on the Advisory Boards of Allergan, Almatica, Brainsway, Janssen, Lundbeck, Myriad Neuroscience, Otsuka and Purdue Pharma (Canada); M.V.A. is on the Speaker’s Bureau for Allergan, Lundbeck, Otsuka, Pfizer, Purdue Pharma (Canada) and Takeda; and has received research support from Janssen, Purdue Pharma (Canada), the Canadian Foundation for Innovation and Hamilton Academic Health Sciences Organization (HAHSO). D.A.M.D.G. has received grant or research support from the Eunice Kennedy Shriver National Institute of Child Health and Human Development subcontract with Duke Clinical Research Center Pediatric Trials Network, Biohaven Pharmaceuticals, Neurocrine Biosciences, Nuvelution Pharma, Peace of Mind Foundation, Syneos Health and Teva Pharmaceutical Industries. He has served as a consultant to the Arlington Youth Counseling Center. He has served on the editorial board of Annals of Clinical Psychiatry. He has received honoraria from the Massachusetts Psychiatry Academy and the American Academy of Child and Adolescent Psychiatry. He has held stock options/ownership in Assurex Health and Revolutionary Road. R.G.G.S. receives a productivity grant from the National Council for Scientific and Technological Development, Brazilian Federal Government (CNPq). L.D. declares that she holds small investments in pharmaceutical and biotechnology firms, including AstraZeneca, Bioventic, Hikma Pharmaceutical, International Biotech Trust, Reneuron, Syncona and Yourgene. U.A. has received lecture honoraria from Lundbeck, Angelini, Janssen, Neuraxpharma and Innova Pharma. There are no conflicts of interest for the remaining authors.