- Correspondence to Professor Alicja Wolk, Division of Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Box 210, Stockholm 171 77, Sweden;
- Received 23 January 2013
- Revised 7 July 2013
- Accepted 9 July 2013
- Published in print 1 November 2014.
- Published online 5 October 2014.
- Published first 12 August 2013.
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