“…The CCI was first developed and validated to evaluate the risk of death and burden of disease (Charlson, Pompei, Ales, & MacKenzie, ; Charlson, Szatrowski, Peterson, & Gold, ). It has been widely used in clinical research to manage the confounding influence of comorbidities to standardize comorbidities extracted from medical records, administrative databases, or self‐report and to predict outcomes (Charlson, Wells, Ullman, King, & Shmukler, ; Frenkel, Jongerius, Uitert, Munster, & Rooij, ; Jiang et al, ; Neuhaus, King, Hageman, & Ring, ). The weighted index of comorbidity was computed using the Charlson and colleagues' () assigned weight for specific diseases.…”