Consumer engagement in health care policy, research and services: A systematic review and meta-analysis of methods and effects. oleh Louise K Wiles, Debra Kay, Julie A Luker, Anthea Worley, Jane Austin, Allan Ball, Alan Bevan, Michael Cousins, Sarah Dalton, Ellie Hodges, Lidia Horvat, Ellen Kerrins, Julie Marker, Michele McKinnon, Penelope McMillan, Maria Alejandra Pinero de Plaza, Judy Smith, David Yeung, Susan L Hillier