RETRACTION: I. Yamawaki, Y. Taguchi, S. Komasa, A. Tanaka, and M. Umeda, “Effects of Glucose Concentration on Osteogenic Differentiation of Type II Diabetes Mellitus Rat Bone Marrow‐Derived Mesenchymal Stromal Cells on a Nano‐Scale Modified Titanium,” Journal of Periodontal Research 52, no. 4 (2017): 761–771, https://doi.org/10.1111/jre.12446