Protocol for an automated, pragmatic, embedded, adaptive randomised controlled trial: behavioural economics-informed mobile phone-based reminder messages to improve clinic attendance in a Botswanan school-based vision screening programme. - Allen, Luke N; Ratshaa, Bakgaki; Macleod, David; Bolster, Nigel; Burton, Matthew; Kim, Min; Bastawrous, Andrew; Ho-Foster, Ari; Chroston, Hannah; Nkomazana, Oathokwa (Trials, 2022)