Name	Info	Provider	Link
Tears	free resource	MedlinePlus Health Information	https://medlineplus.gov/tears.html
	subscription/membership/fee required	Nature Publishing Group	https://doi.org/10.1038/eye.2016.307
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/28085142/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/28085142
	free resource	scite Smart Citations	https://scite.ai/reports/28085142