- Correspondence to Emelie Thern, Department of Public Health Sciences, Karolinska Institutet, Stockholm 171 77, Sweden;
- Received 7 March 2017
- Revised 17 August 2017
- Accepted 1 September 2017
- Published in print 1 November 2017.
- Published online 16 October 2017.
- Published first 18 September 2017.
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