1. Department of Plastic Surgery, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
2. Department of Obstetrics and Gynecology, Kunming Medical University, Kunming, Yunnan 650031, P.R. China
3. School of Public Health, Kunming Medical University, Kunming, Yunnan 650031, P.R. China
4. Department of Cardiology, The Second Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650101, P.R. China