1Moore DE, Speroff T, Grogan E, et al. Cost per- spectives of laparoscopic and open appendectomy [J].Surg Endosc,2005,19:374 - 378.
2Delaney CP, Pokala N, Senagore AJ, et al. Is lapa- roscopic colectomy applicable to patients with body mass index>30 A casematched comparative study with open colectom[J]. Dis Colon Rectum,2005, 48 .. 975 - 981.
