bibliographicCitation |
Bray I, Noble S, Boyd A, Brown L, Hayes P, Malcolm J, Robinson R, Williams R, Burston K, Macleod J, Molloy L, Tilling K. A randomised controlled trial comparing opt-in and opt-out home visits for tracing lost participants in a prospective birth cohort study. BMC Medical Research Methodology. 2015 Jul 24;15(1):52. doi: 10.1186/s12874-015-0041-y. |