We are grateful to Father Tarcisio Ciabatti, Sister Maria Bettinsoli, and Francesco Cosmi (Convenio Ministerio de Salud–Vicariato de Camiri) for their support in carrying out this study, and to the students of the Escuela de Salud del Chaco, Tekove Katu, Gutierrez, for their valuable assistance during the fieldwork. We would like to acknowledge the great work of all the health-care providers, both at the local and central levels, involved in the mass drug administration and PC programme. Last and not least, we would also like to thank the local communities that participated in the study.
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