title: Brief description of WHO protocol for data collection.
authors.affiliation: Department of Pathology, Ogun State University, Sagamu, Nigeria.
authors.forename: O A
authors.initials: OA
authors.lastname: Dada
mesh_terms: D001942:Breast Feeding; D003625:Data Collection / Q000379:methods*; D003906:Developing Countries; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008597:Menstrual Cycle; D010060:Ovulation; D049590:Postpartum Period; D014944:World Health Organization