1 National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA. Electronic address: rabadanc@nhlbi.nih.gov.
2 Centre for Control of Chronic Diseases, International Centre for Diarrheal Disease Research-Bangladesh, Dhaka, Bangladesh.
3 Institute on the Environment, College of Food, Agriculture and Natural Resource Sciences, University of Minnesota, St. Paul, MN, USA; Department of Building Science, Tsinghua University, Beijing, China.