1. Johns Hopkins School of Medicine; Johns Hopkins Medicine; Baltimore Maryland
2. Department of Otolaryngology/Head and Neck Surgery; Johns Hopkins Medicine; Baltimore Maryland
3. Division of Pulmonary, Critical Care, and Sleep Medicine; Drexel Medicine; Philadelphia Pennsylvania U.S.A.
4. Department of Radiology and Radiological Science; Johns Hopkins Medicine; Baltimore Maryland
5. Department of Medicine-Division of Pulmonary and Critical Care Medicine; Johns Hopkins Medicine; Baltimore Maryland