Priorities, barriers, and facilitators towards international guidelines for the delivery of supportive clinical care during an Ebola outbreak: a cross-sectional survey by Battista, M, Loignon, C, Benhadj, L, Nouvet, E, Murthy, S, Fowler, R, Adhikari, N, Haj-Moustafa, A, Salam, A, Chan, A, Mishra, S, Couturier, F, Hudon, C, Horby, P, Bedell, R, Rekart, M, Hajek, J, Lamontagne, F