The 20-minute whole blood clotting test (20WBCT) for snakebite coagulopathy—A systematic review and meta-analysis of diagnostic test accuracy by Lamb, T, Abouyannis, M, de Oliveira, SS, Shenoy K, R, Geevar, T, Zachariah, A, Sharma, SK, Bhatt, N, Mukaka, M, Harriss, E, Lalloo, DG, Ashley, EA, Monteiro, WM, Smithuis, F, Eddleston, M