1 Smell and Taste Clinic, Department of Otorhinolaryngology, TU Dresden, Dresden, Germany; Department of Otorhinolaryngology, Jikei University School of Medicine, Tokyo, Japan.
2 Smell and Taste Clinic, Department of Otorhinolaryngology, TU Dresden, Dresden, Germany.
3 Department of Otorhinolaryngology, University of Kiel, Kiel, Germany.
4 Department of Otorhinolaryngology, Jikei University School of Medicine, Tokyo, Japan.