Inslitute of Endemic Diseases;
Faculty of Public Health;
Key Laboratory of Environment and Genes Related to Diseases of Ministry of Education;
Medicine College of Xi' an Jiaotong University;
Xi' an 710061;
China;
Department of Orthopedics Surgery;
the Second Affiliated Hospital of Xi' an Jiaotong University;
Xi' an 710061;
China;
Shanghai Qisheng Biological preparation Co.Ltd;
Shanghai 201100;
China;