1. Biliary | 1. Burden | 1. Colonoscopy | 1. Appraisal | 1. UK |
2. Bowel | 2. Delay | 2. Community care | 2. Assessment | 2. UK |
3. Digestive system | 3. Epidemiology | 3. Diagnostic | 3. Audit | 3. Britain |
4. Dyspepsia | 4. Load | 4. Emergency | 4. Benefit | 4. England |
5. Gastroenterology | 5. Morbidity | 5. Health maintenance organisation | 5. Best practice | 5. Ireland |
6. Gastrointestinal | 6. Mortality | 6. Management | 6. Cohort | 6. Scotland |
7. Hepatology | 7. Need | 7. Nurse practitioners | 7. Cost | 7. Wales |
8. Intestine | | 8. Open access | 8. Economic | |
9. Liver | | 9. Organisation | 9. Effectiveness | |
10. Pancreatic | | 10. Pathway | 10. Estimate | |
11. Stomach | | 11. Planning | 11. Evaluation | |
| | 12. Postoperative | 12. Evidence | |
| | 13. Primary care | 13. Experiment | |
| | 14. Professional roles | 14. Health promotion | |
| | 15. Provision | 15. Meta-analysis | |
| | 16. Rapid access | 16. Observation | |
| | 17. Resources | 17. Outcome | |
| | 18. Role substitution | 18. Qualitative | |
| | 19. Secondary care | 19. Review | |
| | 20. Self care/management | 20. Study | |
| | 21. Self referral | 21. Survey | |
| | 22. Service(s) | 22. Trial | |
| | 23. Surgery | 23. Volume | |
| | 24. Tertiary care | 24. Waiting (time, list) | |
| | | 25. Economic evaluation | |
| | | 26. Cost effectiveness analysis | |
| | | 27. Cost utility analysis | |
| | | 28. Cost benefit analysis | |