Received: 29 January 2021
Accepted: 7 October 2021
First Online: 23 November 2021
: All methods were carried out in accordance with relevant guidelines and regulations. All experimental protocols were approved by ‘Ethikkommission Nordwest- und Zentralschweiz’. Ethical approval was obtained from the local ethics committee ‘Ethikkommission Nordwest- und Zentralschweiz’. All adolescents, their parents and the therapists provided their informed consent.
: The authors declare that they have no competing interests.