Funding for this research was provided by:
Received: 18 July 2019
Accepted: 9 October 2019
First Online: 5 November 2019
Ethics approval and consent to participate
: Ethics approval was received from the Medical Ethical Committee of the University Medical Center Groningen (METc2013/316). Mental health nurses informed patients who met the inclusion criteria about the study. Nurses explained the purpose and procedure of the study and hereafter, patients received an information letter explaining the study once more. Patients could address their questions at nurses and received time to think about their participation. Nurses are familiar with the patients in their caseload and are capable to distinguish whether a patient has understood what it entails to participate in this study or not. All participants signed written informed consent before participating in this trial.
: Not applicable.
: The authors declare that they have no competing interests.