1 Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, University of Arkansas for Medical Sciences, Little Rock, AR. Electronic address: watchley@uams.edu.
2 Division of Rheumatology, Allergy, and Immunology, Thurston Arthritis Research Center, Chapel Hill, NC.
3 Department of Biostatistics, Gillings School of Global Public Health, Chapel Hill, NC.
4 Department of Medicine, Division of Pulmonary Diseases and Critical Care Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC.