Funding for this research was provided by:
Swiss University Conference (P 10)
Received: 2 January 2019
Accepted: 5 June 2019
First Online: 28 June 2019
Ethics approval and consent to participate
: The study protocol was approved by the Human Research Ethics Committee of the Canton Vaud, acting as the lead ethics committee for Switzerland (Protocol 315/14). Each included patient gave his or her written informed consent.
: Not applicable.
: The authors declare no conflicts of interest. Dagmar M Haller is a member of the Editorial Board (Associate Editor) of BMC.