[1] Univ Hosp Cologne, Cologne Intervent Immunol, Cologne, Germany
[2] Univ Hosp Cologne, Dept Internal Med 1, Cologne, Germany
[3] Univ Hosp Cologne, Dept Otorhinolaryngol, Cologne, Germany
[4] Univ Hosp Cologne, Dept Gen Visceral & Canc Surg, Cologne, Germany
[5] Univ Hosp Basel, Dept Oncol, Basel, Switzerland
[6] Univ Hosp Basel, Tumor Immunol, Basel, Switzerland