Placebo found equivalent to amoxicillin for treatment of acute bronchitis in Nairobi, Kenya: a triple blind, randomised, equivalence trial. - Nduba, V. N.; Mwachari, C. W.; Magaret, A. S.; Park, D. R.; Kigo, A.; Hooton, T. M.; Cohen, C. R. (Thorax, 2008)