TY  - RPRT
TI  - Variation in proficiency testing performance by testing site.
AU  - T M Stull
AU  - T L Hearn
AU  - J S Hancock
AU  - J H Handsfield
AU  - C L Collins
PY  - 1998
DO  - 10.1001/jama.279.6.463
UR  - https://pubmed.ncbi.nlm.nih.gov/9466641/
ID  - 9466641
ER  -