[1] ClinCompetence Cologne GmbH, Cologne, Germany
[2] Univ Cologne, Inst Med Stat & Computat Biol, Fac Med, Cologne, Germany
[3] Free Univ Berlin, Dept Dermatol Venereol & Allergol, Div Evidence Based Med dEBM, Berlin, Germany
[4] Humboldt Univ, Berlin, Germany
[5] Charite Univ Med Berlin, Berlin, Germany
[6] Tech Univ Dresden, Fac Med, Carl Gustav Carus Dept Otorhinolaryngol Head Neck, Dresden, Germany
[7] Tech Univ Dresden, Univ Hosp, Dresden, Germany
[8] Imperial Coll London, Allergy & Clin Immunol Sect, London, England
[9] Inmunotek SL, Madrid, Spain
[10] Clin Competence Cologne GmbH, Theodor Heuss Ring 14, D-50668 Cologne, Germany