[1] Hosp Ruhr Univ Bochum, Vein Ctr, Venenzentrum, St Maria Hilf Hosp,Dermatol & Vasc Surg Clin, Bochum, Germany
[2] Med Off Specialized Phlebol, Hamburg, Germany
[3] Univ Hosp Erlangen, Dept Dermatol Venereol & Allergol, Erlangen, Germany
[4] Med Off Specialized Gen Surg, Helbra, Germany
[5] Schwarzwald Baar Hosp Villingen Schwenningen, Dept Vasc Surg & Vasc Med, Villingen Schwenningen, Germany
[6] URGO GmbH, Med Affairs & Clin Res Dept, Sulzbach, Germany
[7] Univ Hosp Essen, Dept Dermatol Venereol & Allergol, Essen, Germany