Document is current

Article History

Received: 22 December 2017

Accepted: 25 June 2018

First Online: 3 July 2018

Ethics approval and consent to participate

: The study protocols for the 1998 and the 2012 questionnaires were both submitted to the Geneva University Hospital’s Ethics Research Committee and were exempted from a full review by the latter due to the absence of risk they implied for the study populations. The present study is solely based on data extracted from these questionnaires.

: 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.