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Age, gender, and tear break-up time.
Cho P, Yap M. Cho P, et al. Optom Vis Sci. 1993 Oct;70(10):828-31. doi: 10.1097/00006324-199310000-00009. Optom Vis Sci. 1993. PMID: 8247485
Schirmer test. I. A review.
Cho P, Yap M. Cho P, et al. Optom Vis Sci. 1993 Feb;70(2):152-6. doi: 10.1097/00006324-199302000-00011. Optom Vis Sci. 1993. PMID: 8446379 Review.
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