Received: 9 November 2020
Accepted: 10 March 2021
First Online: 18 March 2021
: The protocol and the questionnaire were approved by the ethics committee of the Canton de Vaud (2018–00375). Parents addresses were used to send the participation consent form by postal mail. The participation consent forms were returned by post. For patients < 14 years old at the time of the study, we obtained consent from one of the parents. For patients ≥14 years old at the time of the study, patient and one of the parents had to sign the participation consent form. Indeed, according to the Federal Act on Research involving Human Beings (art.23), “a research project with or without an expected direct benefit may only be carried out in adolescents who are capable of judgement if the adolescent has given informed consent in writing” [CitationRef removed]. Therefore, to participate, parents of adolescent (≥14 years old at the time of the study) needed their consent to fill in the questionnaire of the study.
: Not applicable.
: The authors declare that they have no competing interests.