List of scans recived by a cohort of subjects
cohort_efA data frame with 6315 rows and 8 variables:
subject identificator, integer
sex of the subject, 1-male / 2-female
age of entry at the cohort, numeric
age at exit of the cohort, numeric
disease or not, 0-no disease / 1-disease
age at scan, numeric
dose of the scan, numeric in mGy
country, character