What influences recruitment to randomised controlled trials? A review of trials funded by two UK funding agencies.

"Competing interests MC, DE, IR, JG, AG and AM all hold research grants for multicentre trials from the MRC and, or, the HTA Programme. AM and RK have received salary support from MRC trial grants in the past."

"AcknowledgementsWe would like to thank the National Coordinating Centre for Research Methodology for commissioning this research; the MRC and DH for providing funding; the MRC and HTA Programme for providing documentary material and facilitating access to the PIs of trials. The Health Services Research Unit in Aberdeen is core funded by the Chief Scientist Office of the Scottish Executive Health Department. The views expressed are those of the authors. MC, DE, IR, JG, AG and AM all hold research grants for multicentre trials from the MRC and, or, the HTA Programme. AM and RK have received salary support from MRC trial grants in the past."