1. Department of Plastic and Hand Surgery and Laboratory for Tissue Engineering and Regenerative Medicine, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), University Hospital, Erlangen, Germany.
2. Department of Plastic Surgery, Hand Surgery, Burn Center, University Hospital RWTH Aachen, Aachen, Germany.
3. Institute of Genetic Engineering and Biotechnology, University of Baghdad, Baghdad, Iraq.