Local, national, and regional viral haemorrhagic fever pandemic potential in Africa: a multistage analysis by Pigott, DM, Deshpande, A, Letourneau, I, Morozoff, C, Reiner, RC, Kraemer, MUG, Brent, SE, Bogoch, II, Khan, K, Biehl, MH, Burstein, R, Earl, L, Fullman, N, Messina, JP, Mylne, AQN, Moyes, CL, Shearer, FM, Bhatt, S, Brady, OJ, Gething, PW, Weiss, DJ, Tatem, AJ, Caley, L, De Groeve, T, Vernaccini, L, Golding, N, Horby, P, Kuhn, JH, Laney, SJ, Ng, E, Piot, P, Sankoh, O, Murray, CJL, Hay, SI