1. Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, USA
2. Department of Environmental Medicine, New York University School of Medicine, New York, USA
3. Department of Public Health, Catholic University of Louvain, Brussels, Belgium
4. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, USA
5. Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, USA
6. Chest Institute, Dhaka, Bangladesh
7. Columbia University Arsenic Research Project in Bangladesh, Dhaka, Bangladesh
8. Department of Health Studies and Cancer Research Center, University of Chicago, Chicago, USA