Schnider, Barbara
Disselhoff, Vera
Latal, Beatrice
Wehrle, Flavia
Hagmann, Cornelia
Tuura, Ruth
Article History
Received: 16 September 2020
Accepted: 23 September 2020
First Online: 19 November 2020
Competing interests
: The authors declare no competing interests.
: The study was approved by the local ethical committee. Written informed consent was obtained from a parent as well as from participants aged >15 years. Younger participants provided oral consent.