SOST and type 1 diabetes mellitus: As secondary objectives, we aim to evaluate in a subgroup of participants with T1D (1) if serum AGEs (pentosidine, CML) are independently associated with BMD by DXA, TBS, BTMs, and sclerostin; (2) if there is a correlation between skin and serum AGEs; and (3) if skin and serum AGEs correlate with mean HbA1C over 3 yr.