Study protocol for randomised clinical trial comparing the effectiveness of side-lying sleep positioning to back-lying at reducing oxygen desaturation resulting from obstructive sl... oleh Anne Schilder, Monica Lakhanpaul, Hazel J Evans, Tanya Walsh, Nigel Kirby, Azita Rajai, Helen Robson, Aleksandra Metryka, Johanna G Gavlak, Nichola Hudson, Yin-Ling Lin, Clare Murray, Iain Bruce, Claire Cunniffe