Number of days required to measure sedentary time and physical activity using accelerometery in rheumatoid arthritis: a reliability study. - O'Brien CM; Kitas GD; Rayner F; Isaacs JD; Baker KF; Pratt AG; Buckley CD; Raza K; Filer A; Siebert S; McInnes I; McGucken A; et al. (Rheumatology international, 2023)