Funding for this research was provided by:
Swiss Federal Office of Statistics
Text and Data Mining valid from 2018-10-16
Received: 16 June 2017
Accepted: 1 October 2018
First Online: 16 October 2018
Ethics approval and consent to participate
: Local approval for this study was obtained from the ethical review board of the University of Lausanne, the Commission cantonale d’éthique de la recherche sur l’âtre humain. All patients gave written consent prior to participating.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.