Genome-wide epistasis and co-selection study using mutual information by Pensar, J, Puranen, S, Arnold, B, MacAlasdair, N, Kuronen, J, Tonkin-Hill, G, Pesonen, M, Xu, Y, Sipola, A, Sanchez-Buso, L, Lees, JA, Chewapreecha, C, Bentley, SD, Harris, SR, Parkhill, J, Croucher, NJ, Corander, J