1. Clinical Research and Evidence-Based Medicine Unit; Second Medical Department; Aristotle University of Thessaloniki; Thessaloniki Greece
2. First Department of Internal Medicine; “Papageorgiou” Hospital; Thessaloniki Greece
3. Institute of Social and Preventive Medicine & Clinical Trials Unit; University of Bern; Bern Switzerland
4. Second Propaedeutic Department of Internal Medicine; Aristotle University of Thessaloniki; Thessaloniki Greece
5. Harris Manchester College; University of Oxford; Oxford UK