1. The Antiagers Clinic, Athens, Greece
2. Southern Illinois University School of Medicine, IL, USA
3. California State University Sacramento, CA, USA
4. University of San Francisco California, CA, USA
5. North Carolina State University, NC, USA
6. Summer M. Redstone Burn Center, Department of Surgery, Massachusetts General Hospital, Boston, MA, USA
7. Department of Plastic Surgery, MST Enschede, ZGT Almelo, Netherlands
8. Department of Plastic Surgery, Maastricht University Medical Center+, P. Debyelaan 25, 6229 HX Maastricht, Netherlands.