6Wiersma F, et al. US features of the normal appendix and surrounding area in children. Radiology, 2005 : 1018 - 1022.
7Yi - Jung C, Man - Shan K. Journal of pediatric gastroenterology and nutrition. Usefulness of ultrasonography in acute appendicitis in early. Childhood, 2007,44 : 592 - 595.
8Kim YS, Kim Y, Cho OK, et al. Sonography for fight lower quadrant pain. J Clin Ultrasound ,2001 ,29 (3) :157- 185.