Fatty acid compositions of human breast milk in five regions of China　CHEN Aiju¹, ZHANG Weili¹, JIANG Minghua¹, HE Jiamin¹, WU Shengmei¹, HUANG Qitai², ZHENG Min² (1.Shanghai Institute for Pediatric Research, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200092, China; 2.Beijing Nutrition Institute, Shengyuan Nutritional Food Co., Ltd, Beijing 101101, China)