Peter Barss, M.D., Sc.D., M.P.H., is Head of Health Intelligence and Territorial Epidemiologist for the Canadian Arctic and Adjunct Professor of Epidemiology at McGill University, Montreal, Canada. Gordon Smith, M.B., M.P.H., is Associate Professor of Public Health at Johns Hopkins University, Baltimore. Susan Baker, M.P.H., is Professor of Public Health at Johns Hopkins University. Dinesh Mohan, Ph.D., is State Bank of India Professor at the Indian Institute of Technology, New Delhi.