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Formal ethics-committee approval for this secondary synthesis was therefore not required under applicable national and institutional regulations.","order":1,"name":"Ethics","label":"Ethics approval","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Not applicable (secondary analysis of previously published, fully anonymized data).","order":2,"name":"Ethics","label":"Consent to participate\/consent to publish","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Prospectively registered in\n                      PROSPERO\n                      (CRD420261324766; 23 February 2026; last amended 23 March 2026) and in\n                      OSF Registries\n                      (\n                      \n                      ). Both amendments (pre-specification of the CDC class III\u2013IV subgroup as the primary subgroup of interest, and extension of the search lower bound from 2020 back to January 2015) were made\n                      before any data extraction\n                      .","order":3,"name":"Ethics","label":"Trial\/protocol registration","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The authors declare that they have no competing interests. No author has any financial relationship with industry, has received grants, honoraria, or consultancy fees related to this work, or has received any other form of support for this study.","order":4,"name":"Ethics","label":"Competing interests","group":{"name":"EthicsHeading","label":"Declarations"}}],"article-number":"307"}}