Article History
Received: 14 June 2019
Accepted: 17 June 2019
First Online: 24 June 2019
Compliance with ethical standards
:
: The authors declare no conflict of interest.
: The study was approved by the respective regional ethics committees and the central ethics committee in Stockholm (no. 2013/1258-31/4).
: Informed consent was obtained from all individual participants included in the study.