Methods
RECRUITMENT
The TRIUMPH study was a multicentre, pragmatic, two arm cluster randomised controlled trial in UK primary care. The trial was conducted in 30 general practice sites, with participants recruited from June 2018 to August 2019. The trial design included an internal pilot recruitment phase of four months’ duration, primarily to verify that recruitment was achievable before progression to the main phase of the trial. Specification of an exact figure for the number of eligible participants required by general practices to take part in the trial, as determined by a pre-randomisation practice database search, was removed for the main phase of the trial to allow flexibility according to patients’ response rates.The trial protocol was submitted for publication before recruitment ended, and the trial was registered prospectively on 12 April 2018.