We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleDefining comorbidity: implications for understanding health and health services.AuthorsValderas JM; Starfield B; Sibbald B; Salisbury C; Roland MPublicationAnnals of family medicine, 2009, Vol 7, Issue 4, p357ISSN1544-1717Publication typearticleDOI10.1370/afm.983