1. Institute of Biochemistry, RWTH Aachen University, Aachen, Germany.
2. Institute of Biochemistry Department of Plastic, Hand, and Burn Surgery, RWTH Aachen University, Aachen, Germany.
3. Department of Plastic, Hand, and Burn Surgery, RWTH Aachen University, Aachen, Germany.
4. Dr. Suwelack Skin and Health Care, Billerbeck, Germany.