Quality assurance in surgical trials of arteriovenous grafts for haemodialysis: protocol for a systematic review oleh Mike Stephens, Karen Stevenson, Andrew Jackson, Rajesh Sivaprakasam, Peter Thomson, Ram Kasthuri, Richard D White, Colin Geddes, Francis Calder, Nikolaos Karydis, Emma Aitken, Ben Edgar, David B Kingsmore, Marco Franchin, Nick Inston, Rob G Jones, Gaspar Mestres, Georgios Papadakis, Callum Stove, Lazslo Szabo, Matteo Tozzi