Marycelina Mubi, Annika Janson, Marian Warsame, Andreas Mårtensson, Karin Källander, Max G. Petzold, Billy Ngasala, Gloria Maganga, Lars L. Gustafsson, Amos Massele, Göran Tomson, Zul Premji, Anders Björkman
PLoS One. 2011; 6(7): e19753. Published online 2011 July 5. doi: 10.1371/journal.pone.0019753