1 School of Medicine, Chung Shan Medical University, Taichung, Taiwan, Republic of China; Department of Allergy, Immunology and Rheumatology, Chung Shan Medical University Hospital, Taichung, Taiwan.
2 Center for Global Health, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pa; Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Mass. Electronic address: kevinshengkaima@g.harvard.edu.