Axelrod DA, Sonnad SS, Hirschl RB. An economic evaluation of sonographic examination of children with suspected appendicitis. Journal of Pediatric Surgery 2000; 35(8): 1236-1241.
Fujii Y, Hata J, Futagami K, Hamada T, Mitsuoka H, Teramen K, et al. Ultrasonography improves diagnostic accuracy of acute appendicitis and provides cost savings to hospitals in Japan. Journal of Ultrasound in Medicine 2000; 19(6): 409-414.
Pena BM, Taylor GA, Lund DP, Mandl KD. Effect of computed tomography on patient management and costs in children with suspected appendicitis. Pediatrics 1999; 104(3 Part 1): 440-446.
Pena BM, Taylor GA, Fishman SJ, Mandl KD. Costs and effectiveness of ultrasonography and limited computed tomography for diagnosing appendicitis in children. Pediatrics 2000; 106(4): 672-676.
Terasawa T, Blackmore CC, Bent S, Kohlwes RJ. Systematic review: computed tomography and ultrasonography to detect acute appendicitis in adults and adolescents. Annals of Internal Medicine 2004; 141(7): 537-546.