1. Department of Occupational and Environmental Health, College of Public Health, Zhengzhou University, No. 100 Science Avenue, Zhengzhou City, Henan Province, China
2. Department of Case Management, The Third Affiliated Hospital of Zhengzhou University, China
3. Ultrasonography Department, The Third Affiliated Hospital of Zhengzhou University, China
4. Department of Child and Adolecence Health, School of Public Health, Zhengzhou University, Henan, 450001, China