Rundell SD, Resnik L, Heagerty PJ, Kumar A, Jarvik JG. (2020) Performance of the Functional Comorbidity Index (FCI) in Prognostic Models for Risk Adjustment in Patients with Back Pain. PM R. 2020 Jan 4. doi: 10.1002/pmrj.12315. [Epub ahead of print] PMID: 31901004 [PubMed – as supplied by publisher]