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Operator-dependent techniques for graded compression sonography to detect the appendix and diagnose acute appendicitis. JH Lee,YK Jeong,KB Park. American Journal of Roentgenology . 2005
[3]
Appendix in children with cystic fibrosis: US features. SW Lardenoye,JB Puylaert,MJ Smit,HC Holscher. Radiology . 2004