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Text and Data Mining valid from 2018-06-01
Received: 5 February 2018
Accepted: 16 May 2018
First Online: 1 June 2018
Ethics approval and consent to participate
: All participants signed an informed consent before participating in the study. We declare that the mental health experts of this study have ruled all participants mentally competent to ethically consent to their participation. The procedures of this study were in accordance with the declaration of Helsinki. This study has been approved by the Medical Ethics Committee of the University Medical Center Groningen.
: The authors declare that they have no competing interests.
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