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All participants\u2019 guardians provided written informed consent before recruitment. This study was registered on ChiCTR.org.cn on 7th April 2024 (Identifier: ChiCTR2400082762, Public title: Clinical study on multiple intravenous infusions of umbilical cord blood mononuclear cells to improve the therapeutic effect of autistic children with high expression of serum inflammatory factors).","order":1,"name":"Ethics","label":"Ethics approval and consent to participate","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Informed written consent was obtained from all patients for publication of this report.","order":2,"name":"Ethics","label":"Consent for publication","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The authors declare no competing interests.","order":3,"name":"Ethics","label":"Competing interests","group":{"name":"EthicsHeading","label":"Declarations"}}],"article-number":"301"}}