Geist, R., Weinstein, M., Walker, L., & Campo, J. V. (2008). Medically unexplained symptoms in young people: The doctor’s dilemma. Paediatrics & child health, 13(6), 487–491. Campo, J. V., Perel, J., Lucas, A., Bridge, J., Ehmann, M., Kalas, C., Monk, K., Axelson, D., Birmaher, B., Ryan, N., Di Lorenzo, C., & Brent, D. A. (2004). Citalopram treatment of pediatric recurrent abdominal pain and comorbid internalizing disorders: an exploratory study. Journal of the American Academy of Child and Adolescent Psychiatry, 43(10), 1234–1242. https://doi.org/10.1097/01.chi.0000136563.31709.b0 Saps, M., Youssef, N., Miranda, A., Nurko, S., Hyman, P., Cocjin, J., & Di Lorenzo, C. (2009). Multicenter, randomized, placebo-controlled trial of amitriptyline in children with functional gastrointestinal disorders. Gastroenterology, 137(4), 1261–1269. https://doi.org/10.1053/j.gastro.2009.06.060