American Journal of Rhinology & Allergy. Authors: Sara L. Richer, M.D., Urban W. Geisthoff, M.D. and Urban W. Geisthoff. Department of Otorhinolaryngology, Hospitals of the City of Cologne, Cologne, Germany See all articles by this author Search Google Scholar for this author , Nancy Livada, P.A.-C., P. Daniel Ward, M.D., M.S., Leland Johnson, M.D., Alexander…