- Correspondence to Dr Janneke Heijne, National Institute of Public Health and the Environment, P. O. Box 1, Bilthoven 3720 BA, The Netherlands;
- Received 1 July 2016
- Revised 3 November 2016
- Accepted 28 November 2016
- Published online 16 December 2016.
Abstract in Dutch
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- Abstract in Dutch - Online abstract
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