lawrence j. markovitz md minimally invasive endovenous laser treatment surgery 2015 american board of thoracic surgery 2014 subspecialties certification process varicose vein ablation benefits radiofrequency ablation scholarships fellowships american college of surgeons strategies vein health effects varicose veins lung surgery vats lobectomy annual congress american college of phlebology vein care ambulatory phlebectomy recovery minimally invasive varicose vein treatments clinical congress acs san francisco national board of medical examiners centennial examinations varicose vein treatment sclerotherapy lawrence j. markovitz md
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