[1
]
School of Public Health, Harbin Medical University, Harbin 150081, Heilongjiang, China.
[2
]
Department of General Medicine, The First Affiliated Hospital of China Medical University,
Shenyang 110001, Liaoning, China.
[3
]
School of Public Health, Harbin Medical University, Harbin 150081, Heilongjiang, China,
Department of General Medicine, The First Affiliated Hospital of China Medical University,
Shenyang 110001, Liaoning, China. cmu1h@aliyun.com.