Iwatate M, Sano W, Sano Y.Superficial anal canal squamous cell carcinoma diagnosed using narrow-band imaging and treated by endoscopic submucosal dissection.Dig Endosc. 2015 Jul;27(5):627-9. doi: 10.1111/den.12474. Epub 2015 Apr 20. No abstract available.PMID:25801993