1. Prystowsky JB, Pugh CM, Nagle AP (2005) Appendicitis. Curr Probl Surg 42(10):694–742
2. Ferris M, Quan S, Kaplan BS, Molodecky N, Ball CG, Chernoff GW, Bhala N, Ghosh S, Dixon E, Ng S, Kaplan GG (2017) The global incidence of appendicitis: a systematic review of population-based studies. Ann Surg 266(2):237–241
3. Chong CF, Thien A, Mackie AJ, Tin AS, Tripathi S, Ahmad MA, Tan LT, Ang SH, Telisinghe PU (2011) Comparison of RIPASA and Alvarado scores for the diagnosis of acute appendicitis. Singapore Med J 52(5):340
4. Kalan M, Talbot D, Cunliffe WJ, Rich A (1994) Evaluation of the modified Alvarado score in the diagnosis of acute appendicitis: a prospective study. Ann R Coll Surg Engl 76(6):418
5. Frountzas M, Stergios K, Kopsini D, Schizas D, Kontzoglou K, Toutouzas K (2018) Alvarado or RIPASA score for diagnosis of acute appendicitis? A meta-analysis of randomized trials. Int J Surg 56:307–314