7Li Ruowei, Darling N, Maurice E, et al. Breastfeeding rates in the United States by characteristics of the child [J]. Mother, or Family: The 2002 National Immunization Survey, Division of Nutrition and Physical Activity, Pediatrics,2005, 115(1): 31-37.
8Marianne Lubben, Susannah H Mayhew, Charles Collins, et al. Reproductive health and health sector reform in developing countries: Establishing a framework for dialogue [J]. Bulletin of the World Health Organization, 2002, 80:667-673.