1. Department of Health Laboratory Technology, School of Public Health; China Medical University; Shenyang 110001 People's Republic of China
2. Liaoning Provincial Key Laboratory of Arsenic Biological Effect and Poisoning; China Medical University; Shenyang 110001 People's Republic of China
3. Department of Occupational and Environmental Health, School of Public Health; China Medical University; Shenyang 110001 People's Republic of China