Biography

Prof. Grigorios Leontiadis

Faculty of Health Sciences

McMaster University, Canada


Email: [email protected]


Qualifications

2002 Ph.D., Gastroenterology, Medical School of Democritus University, Alexandroupolis, Greece

1992 MD, Aristotle University of Thessaloniki, Greece


Publications (Selected)

  1. Samnani, S., Forbes, N., Barkun, A. N., Laine, L., Leontiadis, G. I., Alali, A., ... & Tse, F. (2025). WHICH IS THE BEST ENDOSCOPIC HEMOSTATIC THERAPY FOR DIEULAFOY’S LESIONS? A SYSTEMATIC REVIEW AND META-ANALYSIS. Gastrointestinal Endoscopy, 101(5), S674.
  2. Morgano, G. P., Wiercioch, W., Piovani, D., Neumann, I., Nieuwlaat, R., Piggott, T., ... & Schünemann, H. J. (2025). Defining decision thresholds for judgments on health benefits and harms using the grading of recommendations assessment, development, and evaluation (GRADE) evidence to decision (EtD) frameworks: a randomized methodological study (GRADE-THRESHOLD). Journal of clinical epidemiology, 179, 111639.
  3. Piggott, T., Leontiadis, G. I., Herrmann, A., Scahill, K. A., Antó, J. M., Sherman, J. D., ... & Miller, F. A. (2024). We're living through a planetary health crisis: health guidelines must consider planetary health. The Lancet Planetary Health, 8(12), e979-e980.
  4. Bishay, K., Meng, Z. W., Khan, R., Gupta, M., Ruan, Y., Vaska, M., ... & Forbes, N. (2024). Adverse events associated with endoscopic retrograde cholangiopancreatography: systematic review and meta-analysis. Gastroenterology.
  5. Klugar, M., Lotfi, T., Darzi, A. J., Reinap, M., Klugarová, J., Kantorová, L., ... & GRADE Working Group. (2024). GRADE guidance 39: using GRADE-ADOLOPMENT to adopt, adapt or create contextualized recommendations from source guidelines and evidence syntheses. Journal of clinical epidemiology, 174, 111494.
  6. Khan, R., Ruan, Y., Yuan, Y., Khalaf, K., Sabrie, N. S., Gimpaya, N., ... & Forbes, N. (2024). Relative efficacies of interventions to improve the quality of screening-related colonoscopy: a systematic review and network meta-analysis of randomized controlled trials. Gastroenterology.
  7. Dewidar, O., Lotfi, T., Langendam, M. W., Parmelli, E., Parkinson, Z. S., Solo, K., ... & Schünemann, H. J. (2023). Good or best practice statements: proposal for the operationalisation and implementation of GRADE guidance. BMJ evidence-based medicine, 28(3), 189-196.
  8. Dewidar, O., Lotfi, T., Langendam, M., Parmelli, E., Parkinson, Z. S., Solo, K., ... & Schünemann, H. J. (2022). Which actionable statements qualify as good practice statements In Covid-19 guidelines? A systematic appraisal. BMJ evidence-based medicine, 27(6), 361-369.
  9. Ford, A. C., Tsipotis, E., Yuan, Y., Leontiadis, G. I., & Moayyedi, P. (2022). Efficacy of Helicobacter pylori eradication therapy for functional dyspepsia: updated systematic review and meta-analysis. Gut, 71(10), 1967-1975.
  10. Sullivan, K. A., Farrokhyar, F., Leontiadis, G. I., Patel, Y. S., Churchill, I. F., Hylton, D. A., ... & Hanna, W. C. (2022). Routine systematic sampling versus targeted sampling during endobronchial ultrasound: a randomized feasibility trial. The Journal of Thoracic and Cardiovascular Surgery, 164(1), 254-261.
  11. Abraham, N. S., Barkun, A. N., Sauer, B. G., Douketis, J., Laine, L., Noseworthy, P. A., ... & Leontiadis, G. I. (2022). American College of Gastroenterology-Canadian Association of Gastroenterology clinical practice guideline: management of anticoagulants and antiplatelets during acute gastrointestinal bleeding and the periendoscopic period. Journal of the Canadian Association of Gastroenterology, 5(2), 100-101.
  12. Lotfi, T., Hajizadeh, A., Moja, L., Akl, E. A., Piggott, T., Kredo, T., ... & Schünemann, H. J. (2022). A taxonomy and framework for identifying and developing actionable statements in guidelines suggests avoiding informal recommendations. Journal of clinical epidemiology, 141, 161-171.
  13. Tse, F., Liu, J., Yuan, Y., Moayyedi, P., & Leontiadis, G. I. (2022). Guidewire‐assisted cannulation of the common bile duct for the prevention of post‐endoscopic retrograde cholangiopancreatography (ERCP) pancreatitis. Cochrane Database of Systematic Reviews, (3).
  14. Forbes, N., Frehlich, L., Borgaonkar, M., Leontiadis, G. I., & Tse, F. (2021). Canadian Association of Gastroenterology (CAG) position statement on the use of hyoscine-n-butylbromide (buscopan) during gastrointestinal endoscopy. Journal of the Canadian Association of Gastroenterology, 4(6), 259-268.
  15. Tse, F., Moayyedi, P., Waschke, K. A., MacMillan, M., Forbes, N., Carroll, M. W., ... & Leontiadis, G. I. (2021). COVID-19 vaccination in patients with inflammatory bowel disease: Communiqué from the Canadian Association of Gastroenterology. Journal of the Canadian Association of Gastroenterology, 4(1), 49-49.
  16. Piggott, T., Brozek, J., Nowak, A., Dietl, H., Dietl, B., Saz-Parkinson, Z., ... & Schünemann, H. J. (2021). Using GRADE evidence to decision frameworks to choose from multiple interventions. Journal of clinical epidemiology, 130, 117-124.


Profile Details

https://orcid.org/0000-0001-5072-7599

https://experts.mcmaster.ca/display/leontia

https://scholar.google.com.hk/citations?user=wA0ZIHsAAAAJ&hl=en

https://www.researchgate.net/profile/Grigorios-Leontiadis

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