Donald Robert McCaffree1, Neeraj R Desai2. 1. Oklahoma Tobacco Research Center, Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK; Pulmonary Disease, Critical Care and Sleep Section, University of Oklahoma Health Sciences Center, Oklahoma City, OK. Electronic address: robert-mccaffree@ouhsc.edu. 2. Chicago Chest Center and Suburban Lung Associates, Chicago, IL; Division of Pulmonary, Critical Care, Sleep and Allergy, University of Illinois at Chicago, Chicago, IL.