Text and Data Mining valid from 2019-11-12
Received: 6 May 2019
Accepted: 17 October 2019
First Online: 12 November 2019
Compliance with ethical standards
: This article does not contain any studies with (living) human participants or animals performed by any of the authors. No informed consent was required. Ethical approval was obtained by the Ethics Committee of the Canton of Zurich, Nr. KEK ZH-Nr. 15–0686 and 18–0758.
: The authors declare that they have no conflict of interest.