PMID 27696284. ↑ Yorifuji J, Yorifuji T, Tachibana K, Nagai S, Kawai M, Momoi T, Nagasaka H, Hatayama H, Nakahata T (2008). "Craniotabes in Normal Newborns: The Earliest Sign of Subclinical Vitamin D Deficiency". The Journal of Clinical Endocrinology & Metabolism.