1. School of Public Health, Xi’an Jiaotong University, Xi’an, 710061, Shaanxi Province, People’s Republic of China
2. Health Science Center, Xi’an Jiaotong University, Xi’an, 710061, Shaanxi Province, People’s Republic of China
3. School of Nursing, Lanzhou University, Lanzhou, 730000, Gansu Province, People’s Republic of China