[1
]
Department of Respiratory Medicine, Nangang Branch, Heilongjiang Provincial Hospital,
No. 405, Guogeli Steet, Harbin, 150001, Heilongjiang, China.
[2
]
Department of Respiratory Medicine, Nangang Branch, Heilongjiang Provincial Hospital,
No. 405, Guogeli Steet, Harbin, 150001, Heilongjiang, China. honglei-yin@sohu.com.