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Marjolein JE Greuter, Nathalie MA van Emmerik, Maurice GAJ Wouters and Maurits W van Tulder*
* Corresponding author: Maurits W van Tulder maurits.van.tulder@vu.nl
BMC Pregnancy and Childbirth 2012, 12:58 doi:10.1186/1471-2393-12-58