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4. An improved competitive protein binding assay for 1,25 dihydroxyvitamin D;Mallon, J.P.; Hamilton, J.G.; Nauss-Karol, C.;Arch Biochem Biophys,1980
5. Hypercalcaemia in an anephric patient with sarcoidosis: evidence for extrarenal generation of 1,25-dihydroxyvitamin D;Barbour, G.L.; Cobum, J.W.; Slatopolsky, E.; Norman, A.W.; Horst, R.L.;N Engl J Med,1981