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All authors declare that they have no competing interests, financial or otherwise, that are directly or indirectly related to the work submitted for publication, including during the three years prior to submission.","order":1,"name":"Ethics","label":"Conflicts of interest","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"This study was performed in accordance with the principles of the Declaration of Helsinki. The study protocol was reviewed and approved by the Institutional Review Board\/Research Ethics Committee (Comit\u00e9 Institucional de \u00c9tica en Investigaci\u00f3n, CIEI) of the Instituto Nacional de Ciencias Neurol\u00f3gicas, Lima, Peru (approval reference 024\u20132026-CIEI MOG\u2013INCN). 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