1School of Public Health, Xi'an Jiaotong University Health Science Center, Key Laboratory of Trace Elements and Endemic Diseases, National Health and Family Planning Commission, Xi'an, Shaanxi, 710061, PR China
2Department of Occupational and Environmental Health, School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, 710061, PR China
3Clinical Research Center for Endemic Disease of Shaanxi Province, The Second Affiliated Hospital of Xi'an Jiaotong University, No.157 Xi Wu Road, Xi'an, 710004, Shaanxi Province, PR China
4Foot and Ankle Surgery Department, Honghui Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, PR China