The financial support of the German Research Council (DFG) and the
Rockefeller Foundation is gratefully acknowledged. For assistance in data collection we
would like to thank Eugenio Cap, Eduardo Trigo, Juan Poisson, Gladis Contreras, and Miguel
Angeloni. Furthermore, we are obliged to the invaluable support of Andrew Gutierrez with
the biological models to simulate resistance buildup. The usual disclaimer applies.