1. Uyemura MC. Foreign body ingestion in children. Am Acad Fam Physicians 2005;72:287–291.
2. Kelling G. Über Ösophagoskopie, Gastroskopie und Köliosko-pie. Münch Med Wochenschr 1902;49:21–24.
3. Bevan L. The oesophagoscope. Lancet 1868;1:470.
4. Kelly HGB. The origins of oesophagology. In: History of Gas-troenterology: Essay on Its Development and Accomplishments, Chen TS, Chen PS (eds). Informa Health Care, London.1995;91–97.
5. Hutson JM, Beasley SW. The Surgical Examination of Children. Heinman Medical Books, London. 1988;155–157.