Kostakis, G.C. Papadogeorgakis, N. Koumaki, V. Kamakari, S. Koumaki, D. Alexandridis, C., Absence of hotspot mutations in exons 9 and 20 of the PIK3CA gene in human oral squamous cell carcinoma in the Greek population, Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, (109), e53-e58, 2010, 1079-2104, 1528-395X