Risk adjustment for cesarean delivery rates: how many variables do we need? An observational study using administrative databases
Department of Medicine and Public Health, University of Bologna, via San Giacomo 12, Bologna, 40126, Italy
BMC Health Services Research 2013, 13:13 doi:10.1186/1472-6963-13-13Published: 10 January 2013
Additional file 1:
Variables of the four models and source of information.
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