title: Erratum to: Simple steps to develop trial follow-up procedures.
authors.affiliation: Department of Population Health, London School of Hygiene and Tropical Medicine, Keppel St, London, WC1E 7HT, UK. ona.mccarthy@lshtm.ac.uk.
authors.forename: Ona
authors.initials: O
authors.lastname: McCarthy
authors.affiliation: Department of Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, 15-17 Tavistock Place, London, WC1H 9SH, UK.
authors.forename: Rebecca S
authors.initials: RS
authors.lastname: French
authors.affiliation: Department of Population Health, London School of Hygiene and Tropical Medicine, Keppel St, London, WC1E 7HT, UK.
authors.forename: Ian
authors.initials: I
authors.lastname: Roberts
authors.affiliation: Department of Population Health, London School of Hygiene and Tropical Medicine, Keppel St, London, WC1E 7HT, UK.
authors.forename: Caroline
authors.initials: C
authors.lastname: Free