[1] Johns Hopkins Univ, Dept Otolaryngol Head & Neck Surg, Baltimore, MD USA
[2] Charite Univ Med Berlin, Inst Allergol, Berlin, Germany
[3] Free Univ Berlin, Berlin, Germany
[4] Humboldt Univ, Berlin, Germany
[5] Johns Hopkins Univ, Dept Otolaryngol Head & Neck Surg, 4330 Bonfield Court, Oxford, MD 21654 USA