Received: 5 March 2021
Accepted: 16 March 2022
First Online: 11 April 2022
: Ethical clearance was obtained from the Saharawi Health Authorities and the Regional Ethics Committee in Norway (reference number 2014/1155). Informed written consent was obtained from all participants. The study was conducted according to the guidelines provided in the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.