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Dawkins, Lynne and Bauld, Linda and Ford, Allison and Robson, Deborah and Hajek, Peter and Parrott, Steve and Best, Catherine and Li, Jinshuo and Tyler, Allan and Uny, Isabelle and Cox, Sharon (2020) A cluster feasibility trial to explore the uptake and use of e-cigarettes versus usual care offered to smokers attending homeless centres in Great Britain. PLoS ONE , 15 , (10) .