TY  - RPRT
TI  - Sample size calculations for ophthalmologic studies.
AU  - W J Gauderman
AU  - W E Barlow
PY  - 1992
DO  - 10.1001/archopht.1992.01080170112036
UR  - https://pubmed.ncbi.nlm.nih.gov/1580847/
ID  - 1580847
ER  -