Risk adjustment for comparing hospital quality with surgery: how many variables are needed?
Dimick
Justin B
JB
Michigan Surgical Collaborative for Outcomes Research and Evaluation, Department of Surgery, University of Michigan, Ann Arbor, MI 48104, USA. jdimick@umich.edu
Osborne
Nicholas H
NH
Hall
Bruce L
BL
Ko
Clifford Y
CY
Birkmeyer
John D
JD