This is a multicenter prospective collection of data with diagnostic procedures different from standard clinical care in a specific cohort of patients, aimed to evaluate cardiovascular risk stratification with the European Society of Cardiology (ESC)/European Association for the Study of Diabetes (EASD) guidelines and The Steno Type 1 Risk Engine algorithm. The correlation between CVD risk, atherosclerosis, and microvascular complications of diabetes (retinopathy, nephropathy, and neuropathy) will then be evaluated, and the impact of glycemic variability and other glucose metrics on vascular damage will be characterized. The investigators plan to enroll at least 200 consecutive type 1 diabetes mellitus (T1DM) patients who meet all the inclusion criteria and none of exclusion criteria.