Strategies to increase response rate and reduce non-response bias in population health research: a series of randomised controlled trials during a large COVID-19 study by Atchison, CJ, Gilby, N, Pantelidou, G, Clemens, S, Pickering, K, Chadeau-Hyam, M, Ashby, D, Barclay, WS, Cooke, G, Darzi, A, Riley, S, Donnelly, C, Ward, H, Elliott, P

Validity of self-testing at home with rapid severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibody detection by lateral flow immunoassay by Atchison, CJ, Moshe, M, Brown, JC, Whitaker, M, Wong, NCK, Bharath, AA, McKendry, RA, Darzi, A, Ashby, D, Donnelly, CA, Riley, S, Elliott, P, Barclay, WS, Cooke, GS, Ward, H