Funding for this research was provided by:
Skandia Research (Skandia Research)
Received: 16 December 2020
Accepted: 20 April 2021
First Online: 6 May 2021
: The study outline was approved by the Ethics Committee at the University of Lund in 1994 and 1998. Informed written consent was obtained prior to participation.
: Not applicable.
: The authors declare that they have no competing interests.