Kalayci, Mustafa, and Ersan Cetinkaya. “Prevalence and Severity of Pterygium in Somalian Male Population: Can Khat Consumption Have a Synergistic Effect With Ultraviolet Radiation?”. Annals of Medical Research 28, no. 1 (May 25, 2021): 0159–0162. Accessed December 22, 2024. http://annalsmedres.org/index.php/aomr/article/view/335.