1. Surgery versus surveillance in ulcerative colitis patients with endoscopically invisible low-grade dysplasia: a cost-effectiveness analysis 
Ben Parker, MSc, James Buchanan, MA, DPhil, Sarah Wordsworth, MSc, PhD, Satish Keshav, MD, PhD, Bruce George, FRCS, James E. East, MD(Res), FRCP 
Gastrointestinal Endoscopy 
Volume 86, Issue 6, Pages e5 (December 2017)
DOI: /j.gie
Copyright © 2017 American Society for Gastrointestinal Endoscopy Terms and Conditions

2. Figure 1
Surveillance model structure. LGD, Low-grade dysplasia; CRC, colorectal cancer; HGD, high-grade dysplasia.
Gastrointestinal Endoscopy  , e5DOI: ( /j.gie )
Copyright © 2017 American Society for Gastrointestinal Endoscopy Terms and Conditions

3. Figure 2
Immediate surgery model structure and structure of surgery component of surveillance model. LGD, Low-grade dysplasia; CRC, colorectal cancer; IPAA, ileal pouch-anal anastomosis.
Gastrointestinal Endoscopy  , e5DOI: ( /j.gie )
Copyright © 2017 American Society for Gastrointestinal Endoscopy Terms and Conditions

4. Figure 3
Cost-effectiveness acceptability curve. Patient age 25 years, no comorbidities.
Gastrointestinal Endoscopy  , e5DOI: ( /j.gie )
Copyright © 2017 American Society for Gastrointestinal Endoscopy Terms and Conditions

5. Figure 4
Cost-effectiveness acceptability curve. Patient age 65 years, no comorbidities.
Gastrointestinal Endoscopy  , e5DOI: ( /j.gie )
Copyright © 2017 American Society for Gastrointestinal Endoscopy Terms and Conditions