[1] Charite Univ Med Berlin, Berlin, Germany
[2] Free Univ Berlin, Humboldt Univ Berlin, Berlin Inst Hlth, Berlin, Germany
[3] Med Klin mS Hamatol Onkol & Tumorimmunol, Berlin, Germany
[4] Free Univ Berlin, Humboldt Univ Berlin, Berlin Inst Hlth, Klin Neurol Expt Neurol, Berlin, Germany
[5] Univ Klinikum Carl Gustav Carus Dresden, Klin & Poliklin Hals Nasen & Ohrenheilkunde, Dresden, Germany