1. Dermatology University Hospital of Saint‐Etienne Saint‐Etienne France
2. Hammoud Hospital University Medical Center Lebanese University Sidon Lebanon
3. Dermatology Division, Department of Medical, Surgical and NeuroSciences University of Siena Siena Italy
4. Laboratoire de Tribologie et Dynamique Des Systémes, UMR CNRS 5513 Ecole Centrale Lyon France