1. From the Institute of Occupational Medicine and Industrial Hygiene (H.-Y.L.), College of Public Health, National Taiwan University, Taipei, Taiwan; the Institute of Statistical Science (J.-S.H.), Academia Sinica, Taipei, Taiwan; the Stroke Center and Department of Neurology (J.-S.J.), National Taiwan University Hospital, Taipei, Taiwan; and the Departments of Internal Medicine and Environmental and Occupational Medicine (J.-D.W.), National Taiwan University Hospital, Taipei, Taiwan.