1. Department of Delivery Room, Guangzhou Women and Children’s Medical Center, Guangzhou 510623, People’s Republic of China.
2. Department of Maternal, Child and Adolescent Health, School of Medicine, Jinan University, Guangzhou 510632, People’s Republic of China.
3. Department of Nutrition, School of Medicine, Jinan University, Guangzhou 510632, People’s Republic of China.
4. Department of Child Health Care, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou 510623, People’s Republic of China.
5. Department of Science and Technology, Guangzhou Customs, Guangzhou 510623, People’s Republic of China.