8Engel A,Johnos ML,Haynes SG.Health effects of sunlight exposure in the United States:results from the first national health and nutrition examination survey,1971-1974.Arch Dermatil,1998,124(1):72-79.
9Weiss RA,Dover JS.Laser surgery of leg veins.Dermatol Clin,2002,20(1):19-36.
10Goldman MP.Closure of the geater saphenous vein with endoluminal radiofrequency thermal heating of the vein wall in combination with ambulatory phlebectomy:preliminary 6-month follow-up.Dermatol Surg,2000,26(5):452-456.