Ying-Ting Liao1, Po-Shen Ko2, Yi-Tsung Lin3. 1. Department of Chest Medicine, Taipei Veterans General Hospital, Taipei 112, Taiwan. 2. Division of Hematology, Department of Medicine, Taipei Veterans General Hospital, Taiwan. 3. Division of Infectious Diseases, Department of Medicine, Taipei Veterans General Hospital, Taipei 112, Taiwan; Institute of Emergency and Critical Care Medicine, National Yang-Ming University, Taipei, Taiwan. Electronic address: ytlin8@vghtpe.gov.tw.