A Prospective Randomized Study Comparing Polidocanol Foam Sclerotherapy with Surgical Treatment of Patients with Primary Chronic Venous Insufficiency and Ulcer - Campos Jr., Walter; Torres, Inez Ohashi; Silva, Erasmo Simão da; Casella, Ivan Benaduce; Puech-Leão, Pedro (Annals of Vascular Surgery, 2015)