[1
]
Department of Nursing, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi,
PR China. Electronic address: dfyq100@163.com.
[2
]
Department of Nursing, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi,
PR China. Electronic address: roselee@mail.xjtu.edu.cn.
[3
]
Department of Nursing, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi,
PR China. Electronic address: lijin@mail.xjtu.edu.cn.
[4
]
Department of Nursing, First Affiliated Hospital, Xi'an Jiaotong University, Xi'an,
Shaanxi, PR China. Electronic address: liu.miao99@yahoo.com.cn.
[5
]
Department of Epidemiology and Biostatistics, School of Public Health, Xi'an Jiaotong
University Health Science Center, Xi'an, Shaanxi, PR China. Electronic address: tjdshn@mail.xjtu.edu.cn.
[6
]
Department of Medical Statistics, Faculty of Epidemiology and Population Health, London
School of Hygiene and Tropical Medicine, UK. Electronic address: duolao.wang@lshtm.ac.uk.
[7
]
Department of Nursing, First Affiliated Hospital, Xi'an Jiaotong University, Xi'an,
Shaanxi, PR China. Electronic address: ruby3255@yahoo.com.cn.