Chih-Cheng Lai
Department of Intensive Care Medicine, Chi Mei Medical Center, Liouying, Tainan, Taiwan
Chun-Ming Lee
Department of Internal Medicine, St. Joseph's Hospital, Yunlin County, Taiwan
Division of Infectious Disease, Department of Internal Medicine, MacKay Memorial Hospital, Taipei, Taiwan
MacKay Junior College of Medicine, Nursing, and Management, Taipei, Taiwan
Hsiu-Tzy Chiang
Infection Control Center, MacKay Memorial Hospital, Taipei, Taiwan
Min-Chi Lu
Department of Internal Medicine, Chung Shan Medical University, Taichung, Taiwan
Ling-Fang Wang
Yongen Nursing Home, Taichung, Taiwan
Tsai-Ling Tsai
Lukang Christian Nursing Home, Lukang, Taiwan
Mei-Yu Kang
Changhua Christian Hospital Erlin Nursing Home, Changhua, Taiwan
Yi-Ni Jan
Thanksgiving Nursing Home, Taichung, Taiwan
Yi-Ting Lo
Feng-Fung Nursing Home, Taichung, Taiwan
Wen-Chien Ko
Department of Internal Medicine, National Cheng Kung University Hospital and Medical College, Tainan,Taiwan
Shu-Hui Tseng
Centers for Disease Control, Ministry of Health and Welfare, Taiwan
Po-Ren Hsueh * 
Infection Control Society of Taiwan, Department of Laboratory Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei, Taiwan
Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei, Taiwan