7Kiyan G, Gocmen B, Tugtepe H, et al. Foreign body aspiration in children :the value of diagnostic criteria[J]. Int J Pediatr Otorhi- nolaryngol, 2009,73 (7) : 963-967.
8Pinto A, Scaglione M, Pinto F, et al. Tracheobronchial aspiration of foreign bodies : current indications for emergency plain chest radiography[J]. Radiol Med, 2006,111 (4) :497-506.
9Shlizerman L, Mazzawi S, Rakover Y, et al. Foreign body aspira- tion in children:the effects of delayed diagnosis [J]. Am J Oto- laryngol, 2010,31 (5) : 320-324.
10Tokar B, Ozkan R, Ilhan H. Tracheobronchial foreign bodies in children : importance of accurate history and plain chest radiogra- phy in delayed presentation[J]. Clin Radiol, 2004,59 (7) : 609-615.