Sandra Beijer , Erik van Rossum , Pierre S Hupperets , Cor Spreeuwenberg , Marieke van den Beuken , Ron A Winkens , Lisette Ars , Ben E van den Borne , Alexander de Graeff and Pieter C Dagnelie
BMC Public Health 2007, 7:4doi:10.1186/1471-2458-7-4
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