A randomised controlled trial comparing opt-in and opt-out home visits for tracing lost participants in a prospective birth cohort study

Por Bray, Isabelle, Noble, Sian, Boyd, Andy, Brown, Lindsey, Hayes, Pei, Malcolm, Joanne, Robinson, Ross, Williams, Rachel, Burston, Kirsty, Macleod, John, Molloy, Lynn, Tilling, Kate
Publicado no BMC Med Res Methodol (2015)