Cavalier, E. Eastell, R. Jørgensen, N.R. Makris, K. Tournis, S. Vasikaran, S. Kanis, J.A. Cooper, C. Pottel, H. Morris, H.A. on behalf of the IFCC-IOF Committee for Bone Metabolism (C-BM), Correction to: A Multicenter Study to Evaluate Harmonization of Assays for C-Terminal Telopeptides of Type I Collagen (ß-CTX): A Report from the IFCC-IOF Committee for Bone Metabolism (C-BM) (Calcified Tissue International, (2021), 108, 6, (785-797), 10.1007/s00223-021-00816-5), Calcified Tissue International, (108), 825-826, 2021, Springer-Verlag, 0171-967X, 1432-0827