Author Correction: WNT-activated bone grafts repair osteonecrotic lesions in aged animals - B. Salmon; B. Liu; E. Shen; T. Chen; J. Li; M. Gillette; R. C. Ransom; M. Ezran; C. A. Johnson; A. B. Castillo; W. J. Shen; F. B. Kraemer; A. A. Smith; J. A. Helms (Nature Publishing Group (NPG), 2018)
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