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Fig. 1 | BMC Gastroenterology

Fig. 1

From: Trends in upper gastrointestinal diagnosis over four decades in Lusaka, Zambia: a retrospective analysis of endoscopic findings

Fig. 1

Contributions of individual endoscopists over the period 1977–2014. Only those endoscopists who contributed over 500 procedures are shown, except where they were the only doctors performing endoscopy at that time. The other 23 doctors are not shown, for clarity, but contributed 2656 records to the total. The bars at the bottom indicate the equipment in use over the whole period, beginning with non-immersible endoscopes (a) from 1977 to 1991, then immersible fibre-optic Olympus endoscopes (b) from 1991 to 2003, then fibre-optic Pentax endoscopes with camera viewing system (c) from 2003 to 2010, and lastly Pentax high-definition video endscopes (d) from 2010 to date

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