Protocol for a cluster randomised controlled trial of LPG cookstoves compared to usual cooking practices to reduce perinatal mortality and morbidity in rural Bangladesh called Poriborton: the CHANge trial. - Raynes-Greenow, Camille; Alam, Ashraful; Billah, Sk Masum; Islam, Sajia; Agho, Kingsley; Rokonuzzaman, S. M.; Thornburg, Jonathan; El Arifeen, Shams; Chowdhury, Atique Iqbal; The Poriborton Trial Team; Jalaludin, Bin; Goodwin, Nick; et al. (Trials, 2022)