Using social media for patient and public involvement and engagement in health research: The process and impact of a closed Facebook group. - Fedorowicz, Sophia; Riley, Victoria; Cowap, Lisa; Ellis, Naomi J.; Chambers, Ruth; Grogan, Sarah; Crone, Diane; Cottrell, Elizabeth; Clark‐Carter, David; Roberts, Lesley; Gidlow, Christopher J. (Health Expectations, 2022)