Experimental Design, Setting, and Eligibility Criteria

Participants in this 2×2×2 randomized factorial experiment were primary care physicians (5449 in May 2017) who had accepted to receive routine e-mail messages about the Screening Activity Report. Nominated delegates (that is, people designated to access the Screening Activity Report on behalf of eligible physicians) were excluded, a decision that was made because of uncertainties in attributing the intervention to Screening Activity Report access by a delegate (that is, risk of contamination). The Research Ethics Board at Women’s College Hospital approved the study, with a waiver of informed consent for physician participation, given that the study met all Article 3.7A criteria of the Tri-Council Policy Statement^26,27. The study is registered at http://ClinicalTrials.gov/ as {"type":"clinical-trial","attrs":{"text":"NCT03124316","term_id":"NCT03124316"}}NCT03124316.