<https://indexarticles.com/reference/american-family-physician/recommended-childhood-and-adolescent-immunization-schedule-united-states-july-to-december-2004/#webpage>
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<https://indexarticles.com/reference/american-family-physician/recommended-childhood-and-adolescent-immunization-schedule-united-states-july-to-december-2004/>
<https://indexarticles.com/reference/american-family-physician/recommended-childhood-and-adolescent-immunization-schedule-united-states-july-to-december-2004/>