Community based sociotherapy for depressive symptomatology of Congolese refugees in Rwanda and Uganda (CoSTAR): a protocol for a cluster randomised controlled trial oleh Daniel M. Kagabo, Paul Bangirana, Girvan Burnside, Anna Chiumento, Rui Duarte, Darius Gishoma, Michelle Girvan, Angela Jansen, Stefan Jansen, Rosco Kasujja, Rachel Lubunga, Sarah Nevitt, Lucie Nzaramba, Emmanuel Sarabwe, Clare Jackson, Atif Rahman, Annemiek Richters, Jude Robinson, Theoneste Rutayisire, Peter Ventevogel, Ross G. White