“…Pediatrics 2013;132:475-482 AUTHORS: Grace D. Shelby, PhD, a Kezia C. Shirkey, PhD, Dr Shelby conducted psychiatric diagnostic interviews, drafted the initial manuscript, conducted data analyses, and reviewed and revised the manuscript; Dr Shirkey and Ms Sherman conducted psychiatric diagnostic interviews and critically reviewed the manuscript; Dr Beck supervised and conducted psychiatric diagnostic interviews, conducted data analysis, and critically reviewed the manuscript; Dr Haman supervised psychiatric diagnostic interviews, conducted data analysis, and critically reviewed the manuscript; Ms Shears coordinated data collection and critically reviewed the manuscript; Dr Horst reviewed medical records, conducted data analysis, and critically reviewed the manuscript; Dr Smith contributed to conceptualizing and designing the study, supervised data analysis and critically reviewed the manuscript; Dr Garber contributed to conceptualizing and designing the study, provided oversight of psychiatric diagnostic interviewing, and critically reviewed the manuscript; Dr Walker contributed to conceptualizing and designing the study, supervised research activities, oversaw writing of the manuscript, and critically reviewed and revised the manuscript; and all authors approved the final manuscript as submitted. Chronic or recurrent abdominal pain affects 8% to 25% of school-age youth, [1][2][3] is associated with frequent school absences, [4][5][6] and accounts for 2% to 4% of pediatric clinic visits. 7 Many patients, however, have no evidence of structural or biochemical abnormalities underlying their pain, and hence are considered to have medically unexplained or "functional" abdominal pain (FAP).…”