The use of oral contraceptive before pregnancy and breastfeeding duration: A cross-sectional study with retrospective ascertainment
Nelís Soto-Ramírez, Wilfried KarmausVolume:
3
Language:
english
DOI:
10.1186/1746-4358-3-29
Date:
December, 2008
File:
PDF, 239 KB
english, 2008