This review was registered in the PROSPERO database with the code PROSPERO 2018 CRD42018091865; the study protocol and methodology can be accessed at http://www.crd.york.ac.uk/PROSPERO/display_record.php?ID=CRD42018091865. The study received ethics approval with the code CAAE 81020017.2.0000.5327 and title “Obesity as a predictor of chronic kidney disease: systematic review and meta-analysis” and was approved by the Research Ethics Committee of the Hospital de Clínicas de Porto Alegre (No. 2,455,676).
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