1. Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, China
2. Department of Gynaecology and Obstetrics, Jilin Women and Children Health Hospital, Changchun, China
3. Department of Cardiology, Jilin Province People's Hospital, Changchun, China
4. School of Nursing, Jilin University, Changchun, China