OHDSI Greece - National Node
Local Collaboration. European Impact.
The Greek National Node of OHDSI (OHDSI-GR) - led by the eHealth Lab, Institute of Applied Biosciences, Centre for Research and Technology Hellas (INAB|CERTH) -envisions the wider adoption of OMOP-CDM for leveraging observational research within the frame of the OHDSI/EHDEN ecosystem. The OHDSI-GR network began its journey in 2021 and has since achieved the conversion of the database of Papageorgiou General Hospital of Thessaloniki (2023), incorporating data from more than 1.41 million patients. This marks an important first step in the development of the RWD analysis domain in Greece. In parallel, four other data sources have also been funded by EHDEN to convert their data in OMOP-CDM. Notably, the Papageorgiou General Hospital has also joined the EMA DARWIN (February 2025). Finally, it should be noted that the first privately funded study has also started (January 2026). As a whole, 8 studies have been run or are currently in progress.
Community Snapshot
7
DARWIN EU studies
5
Certified organisations / SMEs
2
Research programmes
1+
Hospital networks & studies
The Greek Node brings together academia, healthcare organisations, industry, and policymakers to advance OMOP adoption and real-world evidence generation.
Objectives
- Support sustainable OMOP adoption across Greek hospitals, research groups, and organisations.
- Align Greek data models and vocabularies with European and global OHDSI standards.
- To promote the OHDSI initiative in Greece by expanding the network of partners and encouraging research projects and observational studies at both national and industry levels.
- Regular engagement in OHDSI/EHDEN activities at the European level.
- Support the setup of relevant research infrastructure and projects.
- Connect national efforts to relevant European research programmes & disease-area networks.
- Highlight national needs and opportunities within OHDSI Europe community and policy discussions.
Gallery
Focus areas
Working groups
- ETL Working Group — led by Achilleas Chytas
- Studies Working Group — led by Alexandros Rekkas
International collaborations
- DARWIN EU
- IHI Synthia
- EHDEN Foundation
Activities
- Active dissemination of OHDSI/EHDEN activities across academia, healthcare, policy, and industry.
- Technical and operational support of potential data providers.
- Regular engagement in OHDSI/EHDEN activities at the European level.
- Support the setup of relevant research infrastructure and projects.
Selected publications
- Changes in use and utilisation patterns of drugs with reported shortages between 2010 and 2024 in Europe and North America: a network cohort study. Lancet Public Health. 2025.
- Preliminary Results of an OMOP-CDM Based Characterization Study for Rhabdomyolysis in Greece. Stud Health Technol Inform. 2025.
- Mapping OMOP-CDM to RDF: Bringing Real-World Data to the Semantic Web Realm. Stud Health Technol Inform. 2024.
- Real-World Data in Greece: Mapping the Papageorgiou General Hospital Data to the OMOP CDM. Stud Health Technol Inform. 2024.
- Pharmacovigilance and Clinical Environment: Utilizing OMOP-CDM and OHDSI Software Stack to Integrate EHR Data. Stud Health Technol Inform. 2021.
How to join OHDSI Greece?
Governance
- Lead Institution: eHealth Lab- Institute of Applied Biosciences- Centre for Research and
Technology Hellas (INAB/CERTH) - Pantelis Natsiavas -
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Please do not hesitate to subscribe to the OHDSI-GR email list.
If you want to contact us directly, you can contact
- Pantelis Natsiavas, Researcher, eHealth Lab, Institute of Applied Biosciences, Center
for Research and Technology Hellas, e-mail:
This email address is being protected from spambots. You need JavaScript enabled to view it. - Anastasia Farmaki, Research AssociateeHealth Lab, Institute of Applied Biosciences,
Center for Research and Technology Hellas, e-mail:
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Join the OHDSI Community and select the Europe chapter:
https://www.ohdsi.org/community/Request to be added to the OHDSI GR mailing list / newsletter:
OHDSI GR- CERTHFollow the Node on YouTube:
eHealth Lab- OHDSI GRParticipate in open national events and working groups.
Activities
Useful resources
- Youtube channel: eHealth Lab- OHDSI GR
Upcoming events
- OHDSI Greece Symposium - September 2026 - Thessaloniki Greece
Contributing organizations (selected)
The OHDSI GR Node includes contributions from a wide range of stakeholders across the health data landscape. The selection below highlights active participants in Node activities, events, and working groups.
This is not an exhaustive list and will evolve as the community grows.
Connect to the Greek Node and follow its activities.