El-Hussien, Mahmoud, and Mohamed Hassan. “Neuroendocrine Differentiation in Non-Small Cell Lung Cancer and Its Relation to Different Pathologic Features: An Immunohistochemical Study”. Asian Pacific Journal of Cancer Biology 6, no. 1 (March 21, 2021): 49-55. Accessed April 20, 2024. http://waocp.com/journal/index.php/apjcb/article/view/633.