1. Department of Infectious Tropical Diseases and Microbiology, IRCCS Sacro Cuore don Calabria Hospital, 370242, Negrar, Verona, Italy
2. Department of Control of Neglected Tropical Diseases, World Health Organization, 12024, Geneva, Switzerland
3. Research Triangle Institute International, Washington, DC 20005-3967, USA
4. Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, NG5 1PB, UK