Received: 26 October 2020
Accepted: 4 February 2021
First Online: 20 February 2021
Ethics approval and consent to participate
: Trial registration: The study is approved by the National Ethical Committee (1-10-72-216-15) and the Danish Data Protection Agency (1-16-02-490-15), registered 12 October 2015. Oral and written information was given to parents and patients, and written consents from patients over 15 years of age and parents were received.
: Not applicable.
: The authors declare that they have no conflict of interest. After the study was ended, the manual was published at Akademisk forlag (Danish publisher).