1. University of Ferrara, Ferrara, Italy
2. University of Michigan, Ann Arbor, MI, USA
3. Imperial College London, London, UK
4. San Raffaele Scientific Institute, Milan, Italy
5. University of Milan, Milan, Italy
6. Clinic of Phlebology and Laser Surgery, ‘Vasculab’ Ltd, Chelyabinsk, Russia
7. CLAS -- GVM Care & Research, Rapallo, Genoa, Italy
8. University of Catania, Catania, Italy
9. Eurocenter Venalinfa, San Benedetto del Tronto (AP), Italy
10. University of California, Davis Vascular Center, Sacramento, CA, USA
11. Glomach Medic, Lima, Perù
12. Corda Clinic, Pavia, Italy
13. Crippa Clinic, Milan, Italy
14. Erasmus Medical Center, Rotterdam, Netherlands
15. Vanderbilt University Medical Center, Nashville, TN, USA
16. Instituto Brasilerio de Flebologia, Sao Paulo, Brazil
17. Stony Brook University, New York, NY, USA
18. Espiritu Santo University, Guayaquil, Ecuador
19. Collegium Medicum, University of Nicolaus Copernicus, Bydgoszcz, Poland
20. Punjab University, Chandigarh, India
21. Kabnick Vein Center, Morristown, NJ, USA
22. Universidad Autonoma de Bucaramanga, Bucaramanga, Colombia
23. George Washington University, Washington, DC, USA
24. Putra University, Serdang, Malaysia
25. Jobst Vascular Institute, Toledo, OH, USA
26. University of Washington, Seattle, WA, USA
27. UOC Cure Subacute, IRCCS Maugeri Milano, Italy
28. Center for Vein Restoration, Mesa, AZ, USA
29. Barbantini Clinic, Lucca, Italy
30. The Harley Street Heart and Vascular Center, Singapore
31. University of Cologne, Cologne, Germany
32. St. Vincent's Hospital, University of NSW, Sydney, Australia
33. University of Wien, Wien, Austria
34. University of Bonn, Bonn, Germany
35. Harvard University, Boston, MA, USA
36. Dallas Noninvasive Vascular Laboratory, USA
37. Stanford University School of Medicine, Stanford, CA, USA
38. Vascular Surgery Clinic, Saint-Petersburg, Russia
39. Venous and Lymphatics Disease Institute, Goiás, Brazil
40. Indiana University, Lafayette, IN, USA
41. Bassi-Tessari Foundation, Peschiera del Garda, Italy
42. University Consortium Humanitas Roma, Italy
43. Medical University of Silesia, Krakow, Poland
44. Maastricht University Medical Center, Maastricht, Netherlands
45. Uniklinik Aachen, Aachen, Germany
46. Universidad de Buenos Aires, Buenos Aires, Argentina