1. Vascular Surgery Unit, IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
2. Angiology Department, MD Barbantini Clinic, Lucca, Italy
3. Vascular and Endovascular Surgery Unit, University Hospital of Trieste ASUGI, Trieste, Italy
4. Vascular Surgery Unit, IRCCS Istituto Auxologico Italiano, Milan, Italy
5. Center for Vein Restoration, Mesa, Ariz
6. Anatomy Department, Sapienza University of Rome, Rome, Italy