Text and Data Mining valid from 2018-07-18
Received: 21 April 2018
Accepted: 9 July 2018
First Online: 18 July 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest with the present study.
: The study was approved (1978) by the Ethical Committee of the Zurich University Psychiatric Hospital and has, therefore, been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
: All persons gave their informed consent prior to their inclusion in the study.