Cryo strip versus classic strip of the great saphenous vein

INTERVENTION: Cryo strip of the great saphenous vein versus classic strip of the great saphenous vein. CONDITION: Venous surgery ; Surgery ; Venous surgery PRIMARY OUTCOME: Recurrence, confirmed by venous duplex. SECONDARY OUTCOME: 1. Operation time; 2. Neurological damage after surgery; 3. Quality of life INCLUSION CRITERIA: 1. Patients with primary varicosis and incompetence of the great saphenous vein and saphenofemoral junction (confirmed by duplex) 2. Only patients with C2, C3, C4 varicosis (Clinical, Etiologic, Anatomic, and Pathophysiologic [CEAP]‐classification)