1. An evidence-based approach to studies of the natural history of gastrointestinal diseases: Recurrence of symptomatic Crohn's disease after surgery 
James D. Lewis, Philip Schoenfeld, Gary R. Lichtenstein 
Clinical Gastroenterology and Hepatology 
Volume 1, Issue 3, Pages (May 2003)
DOI: /S (03)
Copyright © 2003 American Gastroenterological Association Terms and Conditions

2. Fig. 1
Survival curve corresponding to the hypothetical data presented in Table 1. Note that no patient is observed to require reoperation during the first 5 years while the reoperation rate was 100% by 10 years of follow-up.
Clinical Gastroenterology and Hepatology 2003 1, DOI: ( /S (03) )
Copyright © 2003 American Gastroenterological Association Terms and Conditions

3. Fig. 2
Survival curves regarding recurrence after primary colectomy in 394 patients with Crohn's colitis, (log rank test, P< 0.01). Slant-dashed line indicates colectomy and ileostomy (n = 65); thin solid line indicates proctocolectomy and ileostomy (n = 89); wide solid line indicates colectomy with ileorectal anastomosis (n = 106); dashed line indicates segmental colonic resection (n = 134). Reprinted with permission from Bernell O, Lapidus A, Hellers G. Recurrence after colectomy in Crohn's colitis. Dis Colon Rectum 2001;44:
Clinical Gastroenterology and Hepatology 2003 1, DOI: ( /S (03) )
Copyright © 2003 American Gastroenterological Association Terms and Conditions