“…For example, Taxay, Roath and Mitchel 22 abandoned the procedure after eight attempts. There are single case reports of a normal biopsy from Bridwell and "Whitehouse, 15 Buchan, 17 Wruble and Kaiser, 18 Midtgaard,19 and Neale,20 in addition to the four cases of Vinnik, Kern and Struthers. 24 Together, with the eleven patients in the present series this group of eighteen patients shows several differences from that with a flat mucosa.…”