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Vrije Univ Amsterdam, Amsterdam UMC, Midwifery Sci, AVAG,Amsterdam Publ Hlth Res Inst, POB 7057, NL-1007 MB Amsterdam, Netherlands Vrije Univ Amsterdam, Amsterdam UMC, Midwifery Sci, AVAG,Amsterdam Publ Hlth Res Inst, POB 7057, NL-1007 MB Amsterdam, Netherlands