Mahajan, Divya, Nikhil Makkar, and Raja Paramjeet Singh Banipal. “Risk Factor in Carcinoma Esophagus in Punjab Region of North India”. Asian Pacific Journal of Cancer Biology 8, no. 3 (September 12, 2023): 211-215. Accessed May 19, 2024. http://www.waocp.com/journal/index.php/apjcb/article/view/1152.