1. Department of Internal Medicine, Henan Cancer Hospital, The Affiliated Cancer Hospital of Zhengzhou University, Zhengzhou, Henan 450008, P.R. China
2. Department of Health Center, Henan Airport Group Co., Ltd., Zhengzhou, Henan 450000, P.R. China
3. Department of Oncology, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, P.R. China