9Chan MY,Teo BS, Ng BL. The alvarado score and acute appendicitis [ J ]. Annals of the Academy of Medicine Singapore,2001, 30(5) :510.
10McGory M ,Zingmond DS ,Tillou A, et al. Negative appendectomy in pregnant women is associated with a substantial risk of fetal loss[J]. J Am Coll Surg,2007,205(4):534-540.