[1] Univ Hosp Ulm, Dept Gen Visceral & Transplantat Surg, Ulm, Germany
[2] Univ Ulm, Inst Organ Chem Macromol Chem & Organ Mat, Ulm, Germany
[3] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
[4] Univ Ulm, Dept Elect Microscopy, Ulm, Germany
[5] Univ Halle Wittenberg, Dept Dermatol & Venereol, Halle, Germany