<qa>  What is the name of the epidemiology of hypoparathyroidism?Very few data has been published on the epidemiology of hypoparathyroidism worldwide. None exists specifically in France. Hypoparathyroidism could led to complications: e.g. symptomatic hypocalcemia, calcifications brain, eye and other soft tissues, nephrolithiasisnephrocalcinosis, renal insufficiency. Here,the investigators plan to collect data about both epidemiology, medication and complication of hypoparathyroidism in France. 