Vitamin D insufficiency in COVID-19 and influenza A, and critical illness survivors: a cross-sectional study by Hurst, EA, Mellanby, RJ, Handel, I, Griffith, DM, Rossi, AG, Walsh, TS, Shankar-Hari, M, Dunning, J, Homer, NZ, Denham, SG, Devine, K, Holloway, PA, Moore, SC, Thwaites, RS, Samanta, RJ, Summers, C, Hardwick, HE, Oosthuyzen, W, Turtle, L, Semple, MG, Openshaw, PJM, Baillie, JK, Russell, CD

Plasma steroid concentrations reflect acute disease severity and normalise during recovery in people hospitalised with COVID-19 by Devine, K, Russell, CD, Blanco, GR, Walker, BR, Homer, NZM, Denham, SG, Simpson, JP, Leavy, OC, Elneima, O, McAuley, HJC, Shikotra, A, Singapuri, A, Sereno, M, Saunders, RM, Harris, VC, Houchen-Wolloff, L, Greening, NJ, Lone, NI, Thorpe, M, Greenhalf, W, Chalmers, JD, Ho, L-P, Horsley, A, Marks, M, Raman, B, Moore, SC, Dunning, J, Semple, MG, Andrew, R, Wain, LV, Evans, RA, Brightling, CE, Kenneth Baillie, J, Reynolds, RM