A meta-analysis of clinical studies conducted during the West Africa Ebola virus disease outbreak confirms the need for randomized control groups by Dodd, LE, Follmann, D, Proschan, M, Wang, J, Malvy, D, Van Griensven, J, Ciglenecki, I, Horby, PW, Ansumana, R, Jiang, J-F, Davey, RT, Lane, HC, Gouel-Cheron, A