RET and neoplasm: First, in the Materials and methods section on p. 2216, the final sentence of the '<i>Immunohistochemistry and tissue microarray</i>' subsection, the authors wish to add a further definition, so that the text reads as follows (changes highlighted in bold): '<b>The positive expression of RET was defined as ≥5% staining of a tumor section</b>; high expression was defined as ≥40% staining of a tumor section, and low expression as <40%'.