serum calcium ( ca ) , phosphorus ( p ) , alkaline phosphatase ( al-p ) , parathyroid hormone ( pth ) , calcitonin ( ct ) , 25-hydroxyvitamin d3 ( 25ohd3 ) , 1,25-dihydroxyvitamin d3 ( 1,25 ( oh ) 2d3 ) levels and urinary excretion of ca , p , hydroxyproline ( oh-p ) and cyclic amp ( camp ) were determined in summer and in winter in 13 thalassaemic children ( 7 aged 3-5 years-group 1- ; and 6 aged 10-13 years-group 2- ) , who had never taken vitamin d supplements or therapy , and in two groups of 14 controls of the same age .
C0006657
25-hydroxyvitamin d3
C2713074
25ohd3