1. Division for Experimental Pathophysiology and Immunology, Biocenter, Innsbruck Medical University, Fritz-Pregl Str 3/IV, A6020 Innsbruck, Austria, Division of Cell Biology, Biocenter, Innsbruck Medical University, Innsbruck, Austria, and Department of Plastic and Reconstructive Surgery, University Clinic, Innsbruck Medical University, Innsbruck, Austria