Alexandersson, Maria
Wang, Eugen Yuhui
Eriksson, Staffan
Article History
Received: 7 March 2018
Accepted: 2 October 2018
First Online: 17 October 2018
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.
: All the participants gave their written consent and were recruited in agreement with the Helsinki Declaration. The study was approved by the Regional Ethical Review Board in Stockholm (reference number 2011/1625-31/1 and 2014/1528-32).