1. Chongqing Prevention and Treatment Hospital for Occupational Diseases, Chongqing, China.
2. Children's Hospital of Chongqing Medical University, Chongqing, China.
3. Key Laboratory of Diagnostic Medicine (Ministry of Education), Department of Clinical Biochemistry, College of Laboratory Medicine, Chongqing Medical University, Chongqing, China.
4. Department of Endocrinology, The Ba Yan Nao Er Hospital, Bayannaoer, Inner Mongolia, China.
5. Department of Pediatrics, University of Mississippi Medical Center, Jackson, Mississippi.
6. Department of Endocrinology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China.