1. From the Institute of Preventive Medicine (K.-L.C.), College of Public Health, National Taiwan University, Taiwan; the Departments of Internal Medicine (T.-C.S., H.-C.H., P.-C.C., M.-F.C., Y.-T.L.) and Emergency Medicine (W.-T.C.), National Taiwan University Hospital, Taiwan; and China Medical University Hospital (F.C.S., Y.-T.L.), Taichung, Taiwan.