1. Division of Pulmonary and Critical Care Medicine; Mayo Clinic; Rochester Minnesota U.S.A
2. Department of Otorhinolaryngology-Head and Neck Surgery; Mayo Clinic; Rochester Minnesota U.S.A.
3. Department of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, Minnesota, U.S.A.; Tel Aviv University Sackler Faculty of Medicine; Tel Hashomer Israel
4. Sheba Medical Center; Tel Aviv University Sackler Faculty of Medicine; Tel Hashomer Israel