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Gulmann C, Butler D, Kay E, Grace A, Leader M.Gulmann C, et al. Among authors: butler d.Histopathology. 2003 Jan;42(1):70-6. doi: 10.1046/j.1365-2559.2003.01556.x.Histopathology. 2003.PMID: 12493028
Callagy G, O'Grady A, Butler D, Leader M, Kay E.Callagy G, et al. Among authors: butler d.Gynecol Oncol. 2000 Jan;76(1):73-9. doi: 10.1006/gyno.1999.5661.Gynecol Oncol. 2000.PMID: 10620445
Grace A, Butler D, Gallagher M, Al-Agha R, Xin Y, Leader M, Kay E.Grace A, et al. Among authors: butler d.Appl Immunohistochem Mol Morphol. 2002 Sep;10(3):221-4. doi: 10.1097/00129039-200209000-00006.Appl Immunohistochem Mol Morphol. 2002.PMID: 12373147