Dratva, Julia http://orcid.org/0000-0002-9003-2027
Caviezel, Seraina
Schaffner, Emmanuel
Stolz, Daiana
Rothe, Thomas
Kuenzli, Nino
Schmidt-Trucksäss, Arno
Zemp, Elisabeth
Probst-Hensch, Nicole
Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (4026-028099, PMPDP3_129021/1)
Article History
Received: 29 September 2017
Revised: 21 January 2018
Accepted: 23 January 2018
First Online: 6 February 2018
Compliance with ethical standards
: Parents signed written informed consent for adolescent < 18 years; as of 15 years of age, adolescent were asked to provide written informed consent. The study protocol was approved by the respective cantonal Ethical Review Boards.
: The authors declare that they have no conflict of interest.