Additional file 2: of Factors affecting the implementation of childhood vaccination communication strategies in Nigeria: a qualitative study OkuAfiong Oyo-ItaAngela GlentonClaire FretheimAtle EtengGlory AmesHeather MuloliwaArtur KaufmanJessica HillSophie CliffJulie CartierYuri Bosch-CapblanchXavier RadaGabriel LewinSimon 2017 SURE Framework of key domains for the identification of factors affecting the implementation of policy options. (PDF 248 kb)