1. Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, New York, USA
2. Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, Berkeley, California, USA
3. Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, New York, USA
4. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, USA
5. Columbia University Arsenic Project in Bangladesh, Dhaka, Bangladesh