Of the 12 participants with other etiologies, 7 were diagnosed with primary idiopathic disease, 2 autoimmune polyglandular syndrome type 1 (APS‐1), 1 autosomal dominant hypocalcemia (activating mutation of the calcium‐sensing receptor [CaSR]), 1 HDR syndrome (hypoparathyroidism, sensorineural deafness, and renal disease; also known as Barakat syndrome), and 1 with DiGeorge syndrome. Here, CASR is linked to Autoimmune polyendocrinopathy type 1.