TY  - RPRT
TI  - Invited commentary: ecologic biases.
AU  - S Piantadosi
PY  - 1994
DO  - 10.1093/oxfordjournals.aje.a117070
UR  - https://pubmed.ncbi.nlm.nih.gov/8178789/
ID  - 8178789
ER  -