TY  - RPRT
TI  - Observer and site variation in multiple puncture tuberculin testing.
AU  - S GILLIS
AU  - P STRADLING
PY  - 1957
DO  - 10.1016/s0041-3879(57)80068-3
UR  - https://pubmed.ncbi.nlm.nih.gov/13401509/
ID  - 13401509
ER  -