The Africa Ethics Working Group (AEWG): a model of collaboration for psychiatric genomic research in Africa by Kamuya, D, Bitta, M, Addissie, A, Naanyu, V, Palk, A, Mwaka, E, Kamaara, E, Tadele, G, Wolde, TT, Nakigudde, J, Manku, K, Musesengwa, R, Singh, I