- Correspondence to Karin I Proper, Center for Nutrition, Prevention and Health Services, National Institute for Public Health and the Environment, PO Box 1, Bilthoven 3720 BA, The Netherlands;
- Received 30 May 2016
- Revised 24 August 2016
- Accepted 6 September 2016
- Published in print 1 May 2017.
- Published online 9 April 2017.
- Published first 21 November 2016.
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