Land 2007.

Study characteristics
Methods	Parallel RCT, cluster randomised.
Data	USA, multi‐centre cancer clinical trials. Not clear which participants were included in the nested RCT. Total n = 3104; 41.7% of the participants had between 50‐59 years old; 100% females; and 87.7% were White.
Comparisons	Intervention group received a monthly reminder to sites listing participants who were due to have a measure in the next three months. Control group received no reminder.
Outcomes	The receipt of an expected form for a given institution, participant, and assessment time point. A form was considered expected if the participant had survived past the scheduled time point.
Notes	Retention period: unclear
Risk of bias
Item	Authors' judgement	Support for judgement
Allocation concealment?	Unclear	Not reported in the paper.
Adequate sequence generation?	Unclear	Not reported in the paper.
Blinding of participants and personnel?	Yes	Protocol reported as "double‐blind"
Blinding of outcome assessment?	Unclear	Not reported in the paper. Site assessed objective outcome
Incomplete outcome data addressed? All outcomes	Yes	No concerns raised.
Free of selective outcome reporting?	Yes	No concerns raised.
Other sources of bias	Yes	No further concerns raised.
Overall Risk of Bias	Unclear	Unclear