Tear lacritin levels by age, sex, and time of day in healthy adults.
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Seifert K, et al. Among authors: mckown rl.
Invest Ophthalmol Vis Sci. 2012 Sep 25;53(10):6610-6. doi: 10.1167/iovs.11-8729.
Invest Ophthalmol Vis Sci. 2012.
PMID: 22918641
Free PMC article.