A user's guide to selecting a comorbidity index for clinical research
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PII: S0895-4356(05)00436-1
doi:10.1016/j.jclinepi.2005.11.013
© 2006 Elsevier Inc. All rights reserved.
PII: S0895-4356(05)00436-1
doi:10.1016/j.jclinepi.2005.11.013
© 2006 Elsevier Inc. All rights reserved.