School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.|School of Public Health, Health Science Center, Xian Jiaotong University, Xian, China.