Symptoms and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) positivity in the general population in the United Kingdom by Vihta, K-D, Pouwels, KB, Peto, TEA, Prithard, E, Eyre, DW, House, T, Gethings, O, Studley, R, Rourke, E, Cook, D, Diamond, I, Crook, D, Matthews, PC, Stoesser, N, Walker, AS