Alessandra Pontiroli, Tanya T. Khera, Brian B. Oakley, Sam Mason, Scot E. Dowd, Emma R. Travis, Girum Erenso, Abraham Aseffa, Orin Courtenay, Elizabeth M. H. Wellington
PLoS One. 2013; 8(7): e68648. Published online 2013 Jul 18. doi: 10.1371/journal.pone.0068648