3Milligan ETC, Morgan CN, Nanton LE, et al. Surgical anatomy of the anal canal and the operative treatment of hemorrhoids. Laneet, 1937, 2:1119.
4Longo A. Treatment of hemorrhoids disease by reduction of mucosa and hemorrhoidal prolapse with a circular suturing device: a new procedure Proceedings of the 6th world congress of endoscopic: surgery. Rome, Italy, 1998, 3.
5Abrainowitz L, Godeberge P, Staumont G, et al. French National Society of Coloproctology. Clinical Practice Guidelines for the treatment of hemorrhoidal disease. June-July 2001.Masson.
6Cataldo P, Ellis CN, Gregoreyk S, et al. The Standards Practice Task Force, The American Society of Colon and Rectal Surgeons, USA. Practice parameters for the management of hemorrhoids (revised). Dis Colon Rectum, 2005, 48:189- 194.
7Mtomare DF, Roveran A, Pecorella G, et al. The treatment of hemorrhoids: guidelines of the Italian Society of Colorectal Surgery. Tech Coloproctol, 2006,10:181-186.
8Bikhchandani J, Agarwal PN, Kant R, et al. Randomized controlled trial to compare the early and mid-term results of stapled versus open hemorrhoidectomy. Am J Surg, 2005, 189: 56-60.
9Allegra G. Experience with mechanical staplers: hemorrhoidectomy using a circular stapler. G Chirm, 1990,11:95-97.
10Bruni T, Occelli G. The italian Society of Colorectal Surgery (SICCR) Tech Coloproctol , 2006, 10:274-275.