Comparison of GFR estimation equations using creatinine, cystatin C, and their combination in pediatric hematology–oncology: no single equation is superior across subgroups. - Phillips, Katelyn J.; Sun, Yilun; Tang, Li; Pappas, Andrew; Cross, Shane J.; Pauley, Jennifer L.; McCormick, John; Molinelli, Alejandro R.; Bissler, John J.; Christensen, Anthony M.; Stewart, Clinton F. (Pediatric Nephrology, 2025)