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    Academic Journal

    Source: Irigoyen, Matilde and LaRussa, Philip and Findley, Sally E and Chen, Shaofu and Caesar, Arturo and Tesler, Peter (2003) Impact of the Advisory Committee on Immunization Practices’ 4-Day Grace Period in a Low-Income Community. American Journal of Preventive Medicine, 25 (3). pp. 245-250.

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    Book

    Source: In Nelson Textbook of Pediatrics Edition: 22nd Edition. 2025:1999-2005

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