One year after inclusion, patient files will be reviewed and the following information registered: Whether the patient is alive and any cardiovascular rehospitalisation. In the case of hospitalization, the date of admission, duration and diagnosis will be registered. Statistical considerations and data analysis Baseline data of SDF-1α levels and patient demographics (including comorbidities and use of medication) will be evaluated using descriptive statistics. Normally distributed data will be presented as mean and standard deviation, whereas skewed data will be presented as median and range. If necessary, skewed data will be transformed.