TY  - RPRT
TI  - Why predictive indexes perform less well in validation studies. Is it magic or methods?
AU  - M E Charlson
AU  - K L Ales
AU  - R Simon
AU  - C R MacKenzie
PY  - 1987
UR  - https://pubmed.ncbi.nlm.nih.gov/3689067/
ID  - 3689067
ER  -