1. Department of Endocrinology, The First Affiliated Hospital of The University of South China, Hengyang, Hunan 421001, P.R. China
2. Laboratory of Clinical Anatomy and Reproductive Medicine, University of South China, Hengyang, Hunan 421001, P.R. China
3. Department of Paediatrics, The First Affiliated Hospital of The University of South China, Hengyang, Hunan 421001, P.R. China
4. Emergency Surgery, The First Affiliated Hospital of The University of South China, Hengyang, Hunan 421001, P.R. China