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BMC Pregnancy and Childbirth > 2016 > 16 > 1 > 1-10
BMC Pregnancy and Childbirth > 2015 > 15 > 1 > 1-14
BMC Pregnancy and Childbirth > 2015 > 15 > 1 > 1-10
Maternal and Child Health Journal > 2014 > 18 > 7 > 1610-1618
Journal of Urban Health > 2007 > 84 > 6 > 793-806