Expert-Moderated Peer-to-Peer Online Support Group for People With Knee Osteoarthritis: Mixed Methods Randomized Controlled Pilot and Feasibility Study - Thorlene Egerton; Belinda J Lawford; Penny K Campbell; Melanie L Plinsinga; Libby Spiers; David A Mackenzie; Bridget Graham; Kathryn Mills; Jillian Eyles; Gabrielle Knox; Ben Metcalf; Liam R Maclachlan; et al. (JMIR Formative Research, 2022)