1. Second Department of Thoracic Surgery; First Affiliated Hospital; Medical College of Xi'an Jiaotong University; Xi'an, Shaanxi; PR China
2. General Surgery; People's Hospital of Rizhao; Rizhao, Shandong, PR China
3. Department of Gynecology; Shanghai First Maternity and Infant Hospital; Tongji University School of Medicine; Shanghai, PR China