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BMC Pregnancy and Childbirth > 2017 > 17 > 1 > 1-6
Maternal and Child Health Journal > 2015 > 19 > 4 > 693-699
Maternal and Child Health Journal > 2012 > 16 > 9 > 1870-1878
Journal of Adolescent Health > 2006 > 38 > 5 > 556-559