| Affiliation: | 1. Pulmonary and Critical Care Unit, Massachusetts General Hospital, Boston, Massachusetts;2. Cardiovascular Epidemiology Research Unit, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts;3. Obesity Prevention Program, Department of Population Medicine, Harvard Medical School/Harvard Pilgrim Health Care Institute, Boston, Massachsetts;4. Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts;5. Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts |
