Reducing bias in trials due to reactions to measurement: experts produced recommendations informed by evidence by David P French, Lisa M Miles, Diana Elbourne, Andrew Farmer, Martin Gulliford, Louise Locock, Stephen Sutton, Jim McCambridge, Peter Bower, Stacy Clemes, Mark Conner, Ruth Dundas, Sandra Eldridge, Carrol Gamble, Frank Kee, Alastair Leyland, Rebecca Lynch, Graeme MacLennan, Samuel CS Rowley, Linda Sharples, Falko F Sniehotta, Claire Snowdon, Mirjam Sprangers

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