Evaluation of a multi-component early warning system for pastoralist populations in Doolo zone, Ethiopia: mixed-methods study oleh Luke Baertlein, Bashir Ali Dubad, Birhanu Sahelie, Istifanus Chindong Damulak, Mohammed Osman, Beverley Stringer, Agatha Bestman, Anna Kuehne, Elburg van Boetzelaer, Patrick Keating