Statement: the primary trial is investigating different ways to communicate with women aged 51-73 years old , whereas the secondary trial is not.
Primary_evidence: INTERVENTION 1:    Control Arm   Mail   Standard Reminder Postcard INTERVENTION 2:    Family Physician Reminder Letter Arm   Mail   Standard Reminder Postcard   Family Physician Reminder Letter
Secondary_evidence: INTERVENTION 1:    3D HI and SHI of UCA   Perflutren injection, suspension (IV)0.25 ml followed by 3D Harmonic imaging (HI) then (IV) 20 micro-l/kg followed by 3D subharmonic imaging (SHI)   3D HI and SHI of UCA: Perflutren injection, suspension (IV)0.25 ml followed by 3D Harmonic imaging (HI) then (IV) 20 micro-l/kg followed by 3D subharmonic imaging (SHI)