Chrestella, J., F. Farhat, E. R. Daulay, R. A. Asnir, A. Yudhistira, and I. A. Nasution. “Cyclooxygenase-2 Expression and Its Correlation With Primary Tumor Size and Lymph Node Involvement in Nasopharyngeal Carcinoma”. Open Access Macedonian Journal of Medical Sciences, vol. 6, no. 11, Nov. 2018, pp. 2001-5, doi:10.3889/oamjms.2018.356.