1 Center for Infection Control, National Taiwan University Hospital, Taipei, Taiwan, 2 Department of Information Management, Chang-Gung University, Taoyuan, Taiwan, 3 Department of Laboratory Medicine, Chang Gung Memorial Hospital, Linkou, Taoyuan, Taiwan, 4 Information Systems Office, National Taiwan University Hospital, Taipei, Taiwan, 5 Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan, 6 Department of Internal Medicine, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan