<prompt> Answer this question truthfullyWhat is the historical background of hypoparathyroidism?  <response>: <reason> In 1925, James Bertram Collip along with Douglous B Leitch treated tetany with the help of parathyroid extract. They names the extract as parathyrin. In 1996, Winer and collegues demonstrated a reduction in urinary calcium excretion in patients of hypoparathyroidism when treated with PTH 1-34 teriparatide when compared with treatment with calcitriol and calcium. In 2015, use of recombinant human parathyroid hormone 1-84 rhPTH 1-84 for the management of hypoparathyroidism was approved by the U.S. Food and Drug Administration FDA. 