Polinder-Bos, Harmke A Low Urinary Creatinine Excretion Is Associated With Self-Reported Frailty in Patients With Advanced Chronic Kidney Disease. [electronic resource] - Kidney international reports Jul 2017 - 676-685 p. digital Publication Type: Journal Article ISSN: 2468-0249 Standard No.: 10.1016/j.ekir.2017.02.021 doi