High endogenous estradiol is associated with increased venous distensibility and clinical evidence of varicose veins in menopausal women - Ciardullo, AV; Panico, S; Bellati, C; Rubba, P; Rinaldi, S; Iannuzzi, A; Cioffi, V; Iannuzzo, G; Berrino, F (J Vasc Surg, 2000)