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Background: Pseudovitamin D-deficiency rickets (PDDR) is a rare autosomal recessive disorder resulting from a defect in renal 25-hydroxyvitamin D 1 a-hydroxylase, which is encoded by the CYP27B1 gene.The aim of this study was to identify the CYP27B 1 mutations and investigate the response to short-term treatment of calcitriol in Chinese patients with PDDR.