1. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
2. Department of Otolaryngology, University of São Paulo, São Paulo, Brazil
3. Dental School of Ribeirao Preto, University of São Paulo, Ribeirao Preto, Brazil
4. Biobehavioral Imaging and Molecular Neuropsychopharmacology Unit, National Institute on Drug Abuse, and
5. Laboratory of Clinical Investigation, National Institute on Aging, NIH, Baltimore, Maryland
6. Departament of Psychobiology, Federal University of São Paulo, São Paulo, Brazil
7. Department of Otorhinolaryngology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; and
8. Center for Respiratory Research and Rehabilitation, University of Florida, Gainesville, Florida