- Correspondence to Sara Sjölund, Division of Social Medicine, Department of Public Health Sciences, Karolinska Institutet, Plan 8, Tomtebodavägen 18A, Stockholm 171 76, Sweden;
- Received August 5, 2014
- Revised January 23, 2015
- Accepted January 25, 2015
- First published July 10, 2015.
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- Data supplement 1 - Online supplement
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