[1] Heidelberg Univ, Dept Gen Surg, Heidelberg, Germany
[2] Ctr Rech Cordeliers, INSERM Unite 872, Paris, France
[3] German Canc Res Ctr, Skin Canc Unit, Heidelberg, Germany
[4] Heidelberg Univ, Univ Med Ctr Mannheim, Dept Dermatol Venereol & Allergol, Mannheim, Germany