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Comorbidity of chronic diseases in general practice.
Schellevis FG, van der Velden J, van de Lisdonk E, van Eijk JT, van Weel C. Schellevis FG, et al. J Clin Epidemiol. 1993 May;46(5):469-73. doi: 10.1016/0895-4356(93)90024-u. J Clin Epidemiol. 1993. PMID: 8501473
334 results