TNFRSF11B and diabetes mellitus: As some of the participants in the “non-DM” group (n = 36) belonged to the “ABI below 0.9” (n = 34) and/or “VC” (n = 46) groups, the regulation of serum OPG in diabetes was re-analyzed after the reference group was re-established to exclude the participants in the “ABI below 0.9” and/or “VC” groups from the “non-DM” group.