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Article History

Received: 4 September 2019

Accepted: 28 October 2019

First Online: 20 January 2020

Ethics approval and consent to participate

: The authors assert that all procedures contributing to this work comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008. The project received prior approval (1978) from the Ethical Committee of the Zurich University Psychiatric Hospital.

: The authors declare that they have no competing interests.