the study design of randomization to two treatment arms ( 1,25-dihydroxyvitamin d vs dihydrotachysterol ) requires a total of 108 patients with a minimum of 6 months of treatment to test the long-term effectiveness and safety of 1,25-dihydroxyvitamin d , an essential part of the therapeutic regimen for children with chronic renal insufficiency .
C0012319
dihydrotachysterol
C0022661
chronic renal insufficiency