TY  - RPRT
TI  - Finding high quality, efficient providers for value purchasing: cohort methods better than methods based on events.
AU  - John E Wennberg
AU  - Elliott S Fisher
PY  - 2002
DO  - 10.1097/00005650-200210000-00003
UR  - https://pubmed.ncbi.nlm.nih.gov/12395019/
ID  - 12395019
ER  -