1. Department of Occupational and Environmental Health, Xiangya School of Public Health, Central South University, Changsha, Hunan 410078, China
2. Department of Oncology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
3. The First Affiliated Hospital, University of South China, 69 Chuanshan Road, Hengyang, Hunan 421001, People’s Republic of China