McGavack TH, Reckendorf HK: Therapeutic activity of desiccated thyroid substance, sodium L-thyroxine and D,L- triiodcthyronine: A comparative stuLdy. Am J Med 1956; 20:774-777McGavack, T. H., and Reckendorf, H. K.: Therapeutic activity of desiccated thyroid substance, Sodium L...