Among non-responders to the initial invitation , compliance with a recall by appointment with a specialist practitioner was 50.4 % , significantly higher than with a mail recall ( 38.1 % ; RR :1.33 ; 95 % CI 1.01-1 .76 ) or with a face-to-face counselling with the GP ( 30.8 % ; RR :1.45 ; 95 % CI 1.14-1 .87 ) .