2499600 CKDu chronic kidney disease of unknown etiology 326 2499608 CKDu CKD of unknown etiology 22 2499613 CKDu CKD of unknown origin 7 2499610 CKDu CKD of uncertain etiology 6 2499601 CKDu CKD of undetermined etiology 5 2499605 CKDu Chronic kidney disease of nontraditional causes 3 2499609 CKDu CKD of unknown cause 2 2499606 CKDu chronic kidney disease of unknown etiology characterized by tubulointerstitial damages 1 2499604 CKDu Chronic kidney disease with uncertain etiological factors 1 2499607 CKDu CKD of undetermined cause 1 2499614 CKDu CKD patients, which cannot be attributed to any known etiology 1 2499611 CKDu CKD, particularly in CKD of unknown etiology 1 2499612 CKDu CKD-cause unknown 1