Median PTH was high, whereas median 25 vitamin D was lower than normal [defined as ≥30 ng/ml (75 nmol/L)] and 22% of the patients were considered as having vitamin D deficiency [defined as <15 ng/ml (45 nmol/L), whereas vitamin D insufficiency was defined as serum 25 vitamin D levels between 15 and 30 ng/ml)]. The gene discussed is PTH; the disease is vitamin D deficiency.