Funding for this research was provided by:
Swiss Federal Office of Statistics
Fondation Leenaards
Article History
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.
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