Liesbeth Mollema*, Nancy Wijers, Susan JM Hahné, Fiona RM van der Klis, Hendriek C Boshuizen and Hester E de Melker
* Corresponding author: Liesbeth Mollema Liesbeth.Mollema@rivm.nl
BMC Public Health 2012, 12:57 doi:10.1186/1471-2458-12-57
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