- Correspondence to Emelie Thern, Child and Adolescent Public Health Epidemiology Unit, Department of Public Health Sciences, Karolinska Institutet, Tomtebodavägen 18A, Widerströmska huset, Stockholm 171 77, Sweden;
- Received 29 June 2016
- Revised 23 November 2016
- Accepted 29 December 2016
- Published in print 1 April 2017.
- Published online 7 March 2017.
- Published first 13 January 2017.
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