Received: 31 January 2020
Accepted: 5 June 2020
First Online: 13 June 2020
Ethics approval and consent to participate
: The study was approved by the Regional Ethics Committee, Gothenburg, Sweden (Dnr 1044–13). All patients received oral and written information about their registration in the BOA Register.
: Not applicable.
: The authors declare that they have no competing interests.