“…In a study by Nikakhlagh et al, the most common radiopaque objects were either meat and chicken bones (54 cases, 5.3 %) or metal (44 cases, 4.4 %) [12], while in Boufersaoui's 2013 study of 2,624 patients in Algeria, metal objects (272 cases, 10.36 %) (Hairpins alone counted for 169 cases, along with nails, screws, etc.) Were most common [21]. In a study by Joseph et al in Arizona, United States, nails and screws (6.41 %) were the most common radiopaque FBs [22], while Lan-Fang et al in a 2009 study [23] of 1,027 children in Hangzhou, China, report 6.62 % radiopaque objects, comprising Fish bones in 27 cases (2.6 %) and pig bones in 22 cases (2.1 %).…”