Early results of intersphincteric resection for patients with very low rectal cancer: an active approach to avoid a permanent colostomy. - Saito,N.; Ono,M.; Sugito,M.; Ito,M.; Morihiro,M.; Kosugi,C.; Sato,K.; Kotaka,M.; Nomura,S.; Arai,M.; Kobatake,T. (Dis Colon Rectum, 2004)