E. S. Almutleb, G. A.-R. El-Hiti, F. M. Alotibi, M. M. Al-Grian, M. S. Almutairi, and A. M. Masmali, “The effect of beverages containing caffeine on the tear film parameters: an observational study”, J Pak Med Assoc, vol. 75, no. 09, pp. 1397–1401, Aug. 2025.