Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (PZ00P2_174144, CR23I3_166485)
Text and Data Mining valid from 2019-09-05
Received: 14 February 2019
Accepted: 15 July 2019
First Online: 5 September 2019
Ethics approval and consent to participate
: The study design was approved by the local ethics committee (Kantonale Ethikkommission Zürich; No. EK 2013–0132) and was conducted according to the Declaration of Helsinki. Written informed consent was obtained from all study participants.
: Not applicable
: The authors declare that they have no competing interests.