Safety and Immunogenicity of the malaria vaccine candidate R21 adjuvanted with matrix-m1 in West African adult volunteers, Burkina Faso by Tiono, AB, Ouedraogo, A, Coulibaly, SA, Bougouma, EC, Ouedraogo, IN, Navin, V, Bowyer, G, Ewer, K, Viebig, N, Diarra, A, Glenn, G, Leroy, O, Hill, AV, Sirima, SB