1. Clinical Research and Evidence-Based Medicine Unit; Aristotle University of Thessaloniki; Thessaloniki Greece
2. Second Medical Department; Aristotle University of Thessaloniki; Thessaloniki Greece
3. Evidence-Based Practice Center; Center for the Science of Healthcare Delivery; Mayo Clinic; Rochester MN USA
4. Division of Hematology; Mayo Clinic; Rochester MN USA
5. Harris Manchester College; University of Oxford; Oxford UK