1. Emory University Nell Hodgson Woodruff School of Nursing, Atlanta, Georgia
2. Department of Physiology, Columbia University School of Nursing, New York, New York
3. Departments of Family and Preventive Medicine, Epidemiology, and Nursing, Emory University, Atlanta, Georgia
4. Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, Emory University, Atlanta, Georgia