TY  - RPRT
TI  - Sampling methods for tear stix tests.
AU  - M Norn
PY  - 1992
DO  - 10.1111/j.1755-3768.1992.tb04882.x
UR  - https://pubmed.ncbi.nlm.nih.gov/1488883/
ID  - 1488883
ER  -