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A written consent was obtained from each participant or from parents or guardians of children before enrolment into the study.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval and participant\u2019s consent"}},{"value":"The authors declare that they have no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}]}}