Informed consent in randomised controlled trials: development and preliminary evaluation of a measure of Participatory and Informed Consent (PIC) oleh Julia Wade, Daisy Elliott, Kerry N. L. Avery, Daisy Gaunt, Grace J. Young, Rebecca Barnes, Sangeetha Paramasivan, W Bruce Campbell, Jane M. Blazeby, Alison J Birtle, Rob C. Stein, David J Beard, Alison W Halliday, Jenny L. Donovan, On behalf of the ProtecT study group, CLASS study group, Chemorad study group, POUT study group, OPTIMA prelim study group, CSAW study group and ACST-2 study group