TY  - RPRT
TI  - Data collection & observer bias.
AU  - R W Petri
AU  - R Wears
PY  - 1990
DO  - 10.1016/s0196-0644(05)82208-5
UR  - https://pubmed.ncbi.nlm.nih.gov/2331116/
ID  - 2331116
ER  -