Pre-operative SARS-CoV-2 PCR test at between 48 and 72hours pre-operatively is safe for patients undergoing primary and revision hip and knee arthroplasty – a multicentre internati... by Hamilton, TW, Ingelsrud, LH, Gutman, M, Shearman, A, Gromov, K, Alvand, A, Troelsen, A, Parvizi, J, Price, A