TY  - RPRT
TI  - Observer and experimental variation in tuberculin testing.
AU  - K J Carruthers
PY  - 1970
DO  - 10.1016/0041-3879(70)90128-5
UR  - https://pubmed.ncbi.nlm.nih.gov/5495336/
ID  - 5495336
ER  -