1. Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine , Stanford, California , USA
2. Faculty of Medicine, Federal University of Mato Grosso do Sul , Campo Grande, Mato Grosso do Sul , Brazil
3. Oswaldo Cruz Foundation , Campo Grande, Mato Grosso do Sul , Brazil
4. Department of Epidemiology of Microbial Diseases, Yale School of Public Health , New Haven, Connecticut , USA