The study aims at pooling a large population of patients with suspected coronary artery disease (CAD) who underwent Computed Tomography Coronary Angiography (CTCA) and who were adequately stratified in the first place. Then the investigators will be able to assess the incremental value of CTCA in the stratification of prevalence of disease (non obstructive/obstructive) and prognosis of patients with suspected CAD). The added information to current evidence is how reliable and to what extent CTCA can define the actual burden of disease and cardiovascular risk.