1. Agency For Healthcare Research and Quality Health Cost and Utilization Project (HCUP) http://hcupnet.ahrq.gov/HCUPnet.jsp?Id=A51086BEFE712C11&Form=MAINSEL&JS=Y&Action=%3E%3ENext%3E%3E&_MAINSEL=For%20Children%20Only
2. Agency For Healthcare Research and Quality Health Cost and Utilization Project (HCUP) http://hcupnet.ahrq.gov/HCUPnet.jsp?Id=00C2A34DBE28E828&Form=MAINSEL&JS=Y&Action=%3E%3ENext%3E%3E&_MAINSEL=National%20Statistics
3. The epidemiology of appendicitis and appendectomy in the United States;Addiss;Am J Epidemiol,1990
4. Appendicitis: why so complicated? Analysis of 5755 consecutive appendectomies;Pittman-Waller;Am Surg,2000
5. Clinical features of misdiagnosed appendicitis in children;Rothrock;Ann Emerg Med,1991