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Using text messaging to boost adolescents' receipt of preventive services is understudied in private pediatric offices. In this study at five urban/suburban and two safety-net pediatric practices, 4600 adolescents (age, 11–17 years) who needed at least one dose of a vaccine (tetanus-diphtheria-acellular pertussis, meningococcal conjugate, or human papillomavirus [HPV]) or a well child visit were randomized to usual care or text messaging. Parents of adolescents in the intervention group received a text message about the need for a service and had three options for responding: (1) the practice should call to schedule, (2) the parent will call the practice, or (3) decline further messages. Nonresponders received up to three additional message…