- Correspondence to Dr Janneke Heijne, National Institute of Public Health and the Environment, P.O. Box 1, Bilthoven 3720 BA, The Netherlands;
- Received October 7, 2016
- Revised December 2, 2016
- Accepted January 4, 2017
- First published February 3, 2017.
Abstract in Dutch
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- Abstract in Dutch - Online abstract
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