1. The Airway Mucus Institute and
2. Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Korea;
3. Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medical College and New York–Presbyterian Hospital, New York, New York; and
4. Division of Pulmonary and Critical Care Medicine, Weill Cornell Medical College, New York, New York