Jörn Lötsch1, Thomas Hummel2. 1. Institute of Clinical Pharmacology, Goethe-University, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany and j.loetsch@em.uni-frankfurt.de. 2. Department of Otorhinolaryngology, Smell & Taste Clinic, TU Dresden, Fetscherstr. 74, 01307 Dresden, Germany.