Text and Data Mining valid from 2019-03-25
Received: 15 January 2019
Accepted: 11 March 2019
First Online: 25 March 2019
Ethics approval and consent to participate
: The protocol was approved by the Canton Vaud ethical committee. All participants gave their written informed consent and the study was carried out in compliance with the Helsinki Declaration.
: Not applicable.
: The authors declare that they have no competing interests.
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