Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Joshua J. Gagne and Robert J. Glynn and Jerry Avorn and Raisa Levin and Sebastian Schneeweiss,A combined comorbidity score predicted mortality in elderly patients better than existing scores,Journal of Clinical Epidemiology,0895-4356,Elsevier BV,2011-07,64,7,749-759,https://cir.nii.ac.jp/crid/1361418521442440448,https://doi.org/10.1016/j.jclinepi.2010.10.004