screeningModality:
    MAMMO
|
    TOMO
|
    MRI
;

screeningModalities:
    screeningModalities screeningModality
|
    screeningModality
;

screeningSpec:
    ROUND  number screeningModalities
|
    ATTENDANCERATE distribution
;

screeningSpecs:
    screeningSpecs screeningSpec
|
    // empty
;

screening:
    SCREENING
    screeningSpecs
;
