Mattar, R., Andrade, C. R. A. de, DiFavero, G. M., Gama-Rodrigues, J. J., & Laudanna, A. A. (2002). Preoperative serum levels of ca 72-4, cea, ca 19-9, and Alpha-fetoprotein in patients with gastric cancer . Revista Do Hospital Das Clínicas, 57(3), 89-92. https://doi.org/10.1590/S0041-87812002000300001