1. Department of Health Education , Maternal and Child Health Hospital of Zhangqiu District , Jinan City, Shandong Province, 250200 PR China
2. Department of Nutrition , Maternal and Child Health Hospital of Zhangqiu District , Jinan City, Shandong Province, 250200 PR China
3. Department of Child Healthcare , Maternal and Child Health Hospital of Zhangqiu District , Jinan City, Shandong Province, 250200 PR China
4. Department of Pregnant Women Management Center , Maternal and Child Health Hospital of Zhangqiu District , Jinan City, Shandong Province, 250200 PR China