TY  - RPRT
TI  - Experimental and nonexperimental studies: methodological, ethical, and practical implications in the context of hepatobiliary tumors.
AU  - L Mariani
PY  - 1993
DO  - 10.1002/jso.2930530549
UR  - https://pubmed.ncbi.nlm.nih.gov/8503976/
ID  - 8503976
ER  -