- Correspondence to Professor Bo Burström, Department of Public Health Sciences, Widerströmska Huset, Tomtebodavägen 18A, Karolinska Institutet, Stockholm 171 77, Sweden;
- Received November 27, 2012
- Revised August 21, 2013
- Accepted September 11, 2013
- First published September 30, 2013.
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