[1] Univ Catania, Dept GF Ingrassia, Sect Neurosci, I-95123 Catania, Italy
[2] Univ Florence, Infect & Trop Dis Unit, Florence, Italy
[3] Univ Limoges, Inst Neuroepidemiol & Trop Neurol, EA Trop & Comparat Neuroepidemiol 3174, Limoges, France
[4] Ctr Anthropol Res Teko Guarani, Camiri, Bolivia
[5] Serv Dept Salud, Santa Cruz, Camiri, Bolivia