Pre-notification and reminder SMS text messages with behaviourally informed invitation letters to improve uptake of NHS Health Checks: a factorial randomised controlled trial. av Sallis, A, Sherlock, J, Bonus, A, Saei, A, Gold, N, Vlaev, I, Chadborn, T

Increasing uptake of National Health Service Health Checks in primary care: a pragmatic randomized controlled trial of enhanced invitation letters in Northamptonshire, England. av Sallis, A, Gold, N, Agbebiyi, A, James, RJE, Berry, D, Bonus, A, Vlaev, I, Chadborn, T