1. From the Departments of Community Health Sciences (T.H.J., M.I., R.B., J.H., P.C.) and Medicine (T.H.J.), Aga Khan University, Karachi, Pakistan; International Centre for Circulatory Health, National Heart and Lung Institute, Imperial College London, London, UK (N.C., N.P.); and Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK (S.E.).