1. Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Avenue, Zhengzhou 450000, Henan, China
2. Jining No. 1 People′s Hospital, Jining 272000, Shandong, China
3. Key Laboratory of Molecular Medicine in Henan Province, Zhengzhou University, Zhengzhou 450000, Henan, China