- Correspondence to Koenraad Cuypers, Nord-Trøndelag Health Study Research Center, Norwegian University of Science and Technology, Skjesol Østre, Åsenfjord 7632, Norway;
- Accepted 24 March 2011
- Published in print 1 August 2012.
- Published online 18 July 2012.
- Published first 23 May 2011.
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