Participant Enrollment Metrics. Excluded subjects were those ineligible, declined, refused, or rejected. Dates are given in day/month/year format, and numbers of siblings represent siblings of primary enrolled children. Routine visits include well-child visits, checkups, vaccinations, follow-up appointments, diagnostics, and screening; nonacute illness/sick visits include checkups for chronic illness and visits for injuries or trauma; and visits for “other reasons,” include accompanying siblings and medication-related visits. Abbreviations: AHS, Atlantic Health Systems; BMC, Cooperman-Barnabas Medical Center; NJMS, New Jersey Medical School; RWJMS, Robert Wood Johnson Medical School.