MUSCLE MASS AND MUSCLE FUNCTION IN PATIENTS WITH CHRONIC KIDNEY DISEASE: COMPARATIVE ASSOCIATIONS OF SARCOPENIA INDEX, CREATININE/CYSTATIN C RATIO, AND ESTIMATED GLOMERULAR FILTRATION RATES DIFFERENCE. YHCĐ. 2026;67(CĐ4-HN Ký sinh trùng-HN Hóa sinh 2026). doi:10.52163/yhc.v67iCD4.4849