4Almeida A A, Lopes C M P V, Silva A M S, et al. Trace elements in human milk: Correlation with blood levels, inter-element correlations and changes in concentration during the first month of lactation[ J]. Journal of Trace Elements in Medicine and Biology, 2008, 22(3) : 196-205.
5Yamawaki N, Yamada M, Kan-no T, et al. Macronutrient,mineral and trace element composition of breast milk from Japanese women [J]. J Trace Elem Med Biol, 2005, 19(2) : 171-181.
6Sakha K, Behbahan A G. Training for perfect breastfeeding or metoclopramide: which one can promote lactation in nursing mothers [ J ] .9 Breastfeeding Medicine, 2008,3 (2) : 120-U30.
7Angeletti M A. Workplace lactation program: A nursing friendly initiative [J ]. Journal of Health and Human Services Administration, 2008, 31 (2) :223-239.