3Cusick SE, Mei Z, Cogswell ME. Continuing anemia prevention strategies are needed throughout early childhood in low income preschool children. Pediatrics ,2007,150:422-428.
5Yusi Ouyang, Per Pinstrup -andersen. Health inequality between ethnic minority and Han populations [ J ]. World Development, 2012, 40 (7) : 1452 -1468.
6Jianghong Li, Chun Luo, Nicholas De Klerk. Trends in infant/child mortality and life expecatancy indigenous populations in Yunnan Prov- ince, China [ J ]. Australian and New Zealand Journal of Public Health, 2008, 32 (3): 216-223.
7Hong Liu, Hai Fang, Zhong Zhao. Urban - rural disparities of child health and nutritional status in china from 1989 to 2006 [ J]. Econom- ics and Human Biology, 2012, 11 (3) : 3 -16.