The development of a comorbidity index with physical function as the outcome
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PII: S0895-4356(05)00021-1
doi:10.1016/j.jclinepi.2004.10.018
© 2005 Elsevier Inc. All rights reserved.
PII: S0895-4356(05)00021-1
doi:10.1016/j.jclinepi.2004.10.018
© 2005 Elsevier Inc. All rights reserved.