Using e-mail recruitment and an online questionnaire to establish effect size: A worked example

por Kirkby, Helen M, Wilson, Sue, Calvert, Melanie, Draper, Heather
Publicado 2011

Informing Potential Participants about Research: Observational Study with an Embedded Randomized Controlled Trial

por Kirkby, Helen M., Calvert, Melanie, McManus, Richard J., Draper, Heather
Publicado 2013