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Article History

Received: 15 June 2018

Accepted: 13 December 2018

First Online: 27 December 2018

Ethics approval and consent to participate

: The present study is part of a larger OCD multicentre naturalistic cohort study (NOCDA), for which the Medical Ethical committee of the VU Medical Centre, Amsterdam gave their approval in October 2005 and all of the participating centres have acquired permission to cooperate in this study from their own local Medical Ethical Committees, some in 2006 and some in 2007. As part of this cohort study, all participants received verbal and written information with regard to the objectives and procedure of the study, with specific attention drawn to their right to refuse or stop participating at any time during the study, as well as specific information on the investment required from the participant. Informed consent in written form was obtained from all participants.

: Not applicable

: The authors declare that they have no competing interests.

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