Volunteer bias in recruitment, retention, and blood sample donation in a randomised controlled trial involving mothers and their children at six months and two years: a longitudina...

by Sue Jordan, Alan Watkins, Mel Storey, Steven J Allen, Caroline J Brooks, Iveta Garaiova, Martin L Heaven, Ruth Jones, Sue F Plummer, Ian T Russell, Catherine A Thornton, Gareth Morgan
Published 2013-01-01