1. From the Division of Cardiovascular Medicine (R.D.B.) and Department of Biostatistics (Z.S., B.M.), University of Michigan, Ann Arbor; Air Quality Research Division, Environment Canada, Toronto, Ontario, Canada (J.R.B.); Department of Cardiology, Peking Union Medical College Hospital, Beijing, China (X.Z., Y.R., J.Y., L.S., R.L., H.L., S.Z., Q.F., Z.F.); Division of Cardiovascular Medicine, University of Maryland, Baltimore (X.R., S.R.); Department of Environmental Science and Engineering, Tsinghua...