Received: 7 December 2020
Accepted: 12 February 2021
First Online: 20 March 2021
: The Trøndelag Health Study conforms to the Declaration of Helsinki and was originally approved by the relevant ethics committee [CitationRef removed, CitationRef removed]. All study participants provided written informed consent to be studied and followed-up. The present study was approved by the Regional Committee for Ethics in Medical Research (REK-midt, no. 2018/1509).
: Not applicable.
: The authors have no conflicts of interest to declare.