week, online, home-based, supervised, group rehabilitation programme (REGAIN); or 2) a
single online session of advice (best-practice usual care); is the most clinically and cost-
effective treatment for people with ongoing COVID-19 sequelae more than three months
after hospital discharge. Trial design Multi-centre, 2-arm (1: 1 ratio) parallel group,
randomised controlled trial with embedded process evaluation and health economic …