Vitamin D insufficiency in COVID-19 and influenza A, and critical illness survivors: a cross-sectional study oleh Natalie Pattison, Richard J Mellanby, Ian Handel, Timothy S Walsh, Marlies Ostermann, Mark Lyttle, Adriano G Rossi, David M Griffith, Manu Shankar-Hari, Carlo Palmieri, Lance Turtle, Alexander J Mentzer, Lewis W S Fisher, James Scott-Brown, Danai Papakonstantinou, Effrossyni Gkrania-Klotsas, Kerri Devine, Daniel G Wootton, Padmasayee Papineni, Benjamin W A Catterall, Lara Lavelle-Langham, Emily Cass, Alejandra Doce Carracedo, Lisa Flaherty, Nicole Maziere, Hannah Massey, Anthony Holmes, Nicola Carlucci, Matthew K O'Shea, Emma A Hurst, Natalie Z Homer, Scott G Denham, Paul A Holloway, Romit J Samanta, Thushan de Silva, A A Roger Thompson, Ruth Lyons, Murray Wham, Sara Clohisey, Sara McDonald, Seán Keating, Lorna Finch, Lee Murphy, Nicola Wrobel, Sarah McCafferty, Kirstie Morrice, Alan MacLean, Erin L Aldera, Sneha Basude, Steven Laird, Antonia Ying Wai Ho