Pornvichitpisan , S., and N. Laohapojanart. “Survey of knowledge of outpatients on locations in the refrigerator for eye drop keeping”. Chulalongkorn Medical Journal 54, no. 6 (October 2, 2023). accessed December 10, 2025. https://he05.tci-thaijo.org/index.php/CMJ/article/view/936.