1. Centre for Tropical Diseases, IRCCS Sacro Cuore Don Calabria Hospital, Verona, Italy;
2. Centro de Epidemiologia Comunitaria y Medicina Tropical (CECOMET), Esmeraldas, Ecuador;
3. Carrera de Medicina, Instituto de Biomedicina, Universidad Central del Ecuador, Quito, Ecuador;
4. Infectious Diseases and Tropical Medicine Section, Diagnostic and Public Health Department, University of Verona, Verona, Italy