[1] Beijing Hospital,Department of Pulmonary and Critical Care Medicine
[2] National Center of Gerontology,Graduate School
[3] the Institute of Geriatric Medicine,Department of Infectious Disease
[4] Chinese Academy of Medical Sciences,undefined
[5] Peking Union Medical College,undefined
[6] Chinese Academy of Medical Sciences,undefined
[7] Peking Union Medical College Hospital,undefined
[8] Chinese Academy of Medical Sciences,undefined
[9] Peking Union Medical College,undefined