chiva varicose veins vene varicose safena laser stripping chiva method asval varici laser ablation sclerosanti intervento safena anatomia veneinforma emodinamica venosa flebite gamba gonfia edema trombosi dus telangectasia giacomi venous ulcer treatment venous hemodynamic phlebectomy strippin descending theory ascending theory varicci chirurgia vascolare vena safena vena
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