[1] Univ Dusseldorf, Dept Dermatol, D-4000 Dusseldorf, Germany
[2] Univ Dusseldorf, Dept Radiat Oncol, D-4000 Dusseldorf, Germany
[3] Univ Munster, Dept Dermatol, D-4400 Munster, Germany
[4] Univ Dusseldorf, Dept Otorhinolaryngol, D-4000 Dusseldorf, Germany
[5] Univ Dusseldorf, Dept Biochem, D-4000 Dusseldorf, Germany
[6] Univ Dusseldorf, Dept Hematol Oncol & Clin Immunol, D-4000 Dusseldorf, Germany
[7] German Canc Res Ctr, Dept Genet Skin Carcinogenesis, D-6900 Heidelberg, Germany
[8] Univ Cologne, Dept Dermatol, D-5000 Cologne, Germany
[9] Neurocrine Biosci Inc, San Diego, CA USA