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The written consent and assent (in the case of children under 16) forms of the study were read out or translated to the study participants and children\u2019s parents or legal guardians in their own language, as well as objective of the study was fully explained to them. All the participants received the questionnaire that included questions about their age, sex and residence, types and climatic zones of potable water sources and conditions of water storage at home level. Only volunteer participants who understood and agreed with the basis and procedures of the study signed the informed forms and participated in the study. During sample collection, parts of the stool samples were taken to the nearby health centres\/hospitals and G. duodenalis-positive individuals received anti-protozoal drugs free of charge, and their records were kept confidential.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"17"}}