Kalliakmanis V, Pikoulis E, Karavokyros IG, Felekouras E, Morfaki P, Haralambopoulou G, Panogiorgou T, Gougoudi E, Diamantis T, Leppäniemi A, et al. Acute appendicitis: the reliability of diagnosis by clinical assessment alone. Scand J Surg. 2005;94(3):201-6.