RT Journal Article SR Electronic T1 Vitamin D status and seroconversion for COVID-19 in UK healthcare workers JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 2004234 DO 10.1183/13993003.04234-2020 VO 57 IS 4 A1 Faniyi, Aduragbemi A. A1 Lugg, Sebastian T. A1 Faustini, Sian E. A1 Webster, Craig A1 Duffy, Joanne E. A1 Hewison, Martin A1 Shields, Adrian A1 Nightingale, Peter A1 Richter, Alex G. A1 Thickett, David R. YR 2021 UL http://erj.ersjournals.com/content/57/4/2004234.abstract AB