%0 Journal Article %A Kahan, Brennan C %A Juszczak, Edmund %A Beller, Elaine %A Birchenall, Megan %A Chan, An-Wen %A Hall, Sophie %A Little, Paul %A Fletcher, John %A Golub, Robert M %A Goulao, Beatriz %A Hopewell, Sally %A Islam, Nazrul %A Zwarenstein, Merrick %A Elbourne, Diana %A Montgomery, Alan %D 2025 %F discovery:10204508 %I BMJ %J BMJ %T Guidance for protocol content and reporting of factorial randomised trials: explanation and elaboration of the CONSORT 2010 and SPIRIT 2013 extensions %U https://discovery.ucl.ac.uk/id/eprint/10204508/ %V 388 %Z © The Author 2025. This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license (http://creativecommons.org/licenses/by/4.0/).