1. Department of Labour Hygiene and Sanitary Science, College of Public Health, Xinjiang Medical University, Urumqi, Xinjiang 830011, P.R. China
2. Medical Research Center; 3Tumor Department, Yuebei People's Hospital, Shantou University, Shaoguan, Guangdong 512025, P.R. China
3. Tumor Department, Yuebei People's Hospital, Shantou University, Shaoguan, Guangdong 512025, P.R. China
4. Central Laboratory of Xinjiang Medical University, Xinjiang Medical University, Urumqi, Xinjiang 830011, P.R. China