Figure 1. Examination of the sections after biopsy and histopathologic scoring of the materials stained with hematoxylin and eosin. a) Lack of epithelium in sections; score 0 (x40 enlargement), b) Lightly preserved epithelium layer; score 1 (x200 enlargement), c) Reasonably preserved epithelium layer; score 2 (x100 enlargement), d) Well preserved epithelium layer; score 3 (x200 enlargement).
