The COVID-19 Outpatient Pragmatic Platform Study (COPPS): Study design of a multi-center pragmatic platform trial. - Bunning B; Hedlin H; Purington N; Sundaram V; Kapphahn K; Weng Y; Cunanan K; Maldonado Y; Singh U; Khosla C; O'Hara R; Nicolls M; et al. (Contemporary clinical trials, 2021)