JAG leads endoscopy research, primarily undertaken by our research fellow. In addition, JAG supports a range of research undertaken by external groups.

Key research completed by, or in affiliation with JAG, can be found below:


Ravindran S, Basset P, Shaw T, Dron M, Broughton R, Johnston D, Healey CJ, Green J, Ashrafian H, Darzi A, Coleman M, Thomas-Gibson S. National census of UK endoscopy services in 2019. Frontline Gastroenterology 2020.

Narula P, Broughton R, Howarth L, Piggott A, Bremmer R, Tzivikos C, Gillet P, Henderson P, Rawat D, Cullen M, Loganathan S, Devadason D, Afzal NA, Maginnis J, McKenna S, Thomson M, Green J & Johnston . Paediatric Endoscopy Global Rating Scale: Development of a Quality Improvement Tool and Results of a National Pilot. Journal of Paediatric Gastroenterology and Nutrition 2019.

Siau K, Crossley J, Dunckley P et al. Direct observation of procedural skills (DOPS) assessment in diagnostic gastroscopy: nationwide evidence of validity and competency development during training. Surgical Endoscopy 2019.  

Siau K, Levi R, Iacucci M et al. Paediatric Colonoscopy Direct Observation of Procedural Skills (DOPS): Evidence of Validity and Competency Development. Journal of Pediatric Gastroenterology and Nutrition 2019. 

Siau K, Anderson J T, Valori R, Feeney M, Hawkes N D, Johnson G, McKaig B C, Pullan R D, Hodson J, Wells C, Thomas-Gibson S, Haycock AV, Beales I, Broughton R & Dunckley P. Certification of UK gastrointestinal endoscopists and variations between trainee specialties: results from the JETS e-portfolio. Endoscopy International Open, 2019

Lee T, Siau K, Esmaily S, et al. Development of a national automated endoscopy database: The United Kingdom National Endoscopy Database (NED). United European Gastroenterology Journal, 2019

Siau K, Crossley J, Dunckley P, Johnson G, Haycock A, Anderson JT, Iacucci M, Feeney M.  Training and assessment in flexible sigmoidoscopy: using a novel direct observation of procedural (DOPS) assessment tool. J Gastrointestin Liver Dis. 2019

Sidhu R, Turnbull D, Newton M, et al. Deep sedation and anaesthesia in complex gastrointestinal endoscopy: a joint position statement endorsed by the British Society of Gastroenterology (BSG), Joint Advisory Group (JAG) and Royal College of Anaesthetists (RCoA). Frontline Gastroenterology, 2019.

Malik K, Siau K, Dunckley P, Ward S. Colorectal trainees in the UK struggle to meet JAG certification standards in colonoscopy by the end of their training. Colorectal Disease, 2019.

Siau K, Hodson J, Ravindran S, et al.Variability in cecal intubation rate by calculation method: a call for standardization of key performance indicators in endoscopy. Gastrointenstinal Endoscopy 2019. 

Valori R Joint Advisory Group on Gastrointestinal Endoscopy (JAG) achieves enduring large-scale change Frontline Gastroenterology 201. 

Siau K, Green J, Hawkes N, Broughton R, Feeney M, Dunkley P, Barton JG, Stebbing J and Thomas-Gibson S Impact of the Joint Advisory Group on Gastrointestinal Endoscopy (JAG) on the endoscopy services in the UK and beyond  Frontline Gastroenterology 2018.

Shenbagaraj l, Thomas-Gibson S, Stebbing J, Broughton R, Dron M, Johnston D, Shaw T, Nadim H and Green, J. Endoscopy in 2017: a national survey of practice in the UK. Frontline Gastroenterology 2018.

Siau K, Dunckley P, Valori R, et al. Changes in scoring of Direct Direct Observation of Procedural Skills (DOPS) forms and the impact on competence assessment Endoscopy 2018. 

Video comment on Keith Siau et al. Endoscopy 2018. 

Siau K, Kuwai T, Ishaq S. Analysis of learning curves in gastroscopy training: the need for composite measures for defining competence Gut 2018.

Siau K, Hawkes ND, Dunckley P. Training in Endoscopy 2018.

Siau K, Hodson J, Valori RM, et al. Performance Indicators in Colonoscopy after Certification for Independent Practice: Outcomes and Predictors of Competence 2018. 

Siau K, Levi R, Howarth L et al. Validity Evidence for Direct Observation of Procedural Skills in Paediatric Gastroscopy 2018.

Siau K, Murugananthan A, Dunckley P, et al. National Survey of UK endoscopists showing variation in diathermy practice for colonic polypectomy: a JAG perspective. Frontline Gastroenterology 2018.  


Improving Safety and Reducing Error in Endoscopy (ISREE): A JAG initiative

Review of the Impact of JAG on Endoscopy Services and Training

Validation of Direct Observation of Procedural Skills (DOPS) for Paediatric Colonoscopy

Validation of Direct Observation of Procedural Skills (DOPS) for Paediatric OGD

Aligning JETS Sedation Key Performance Indicator Measurements with current UK standards - does this affect trainee outcome? 

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