Funding for this research was provided by:
Västerbotten Läns Landsting
Received: 24 August 2021
Accepted: 16 March 2022
First Online: 24 March 2022
: The study was approved by the regional ethical committee of Umeå University (Dnr 08-184 M and 07-045 M and Dnr 2017/386–31). All patients gave informed consent to participate in the FECSU study and for the other patients the tests were performed in clinical practice. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that there are no conflicts of interest.