1. University of Ioannina; Department of Orthopaedics; Ioannina Greece
2. Sahlgrenska Academy, University of Gothenburg; Molecular Cell Biology and Regenerative Medicine; Gothenburg Sweden SE-413 45
3. University of Ioannina; School of Medicine; Leoforos Stavrou Niarhou Ioannina Greece 45110
4. Jewish General Hospital, Lady Davis Institute for Medical Research, McGill University; Centre for Clinical Epidemiology; 3755 Cote Ste-Catherine Road Montreal Quebec Canada H3T 1E2
5. University of Ioannina School of Medicine; Department of Hygiene and Epidemiology; Medical School Campus University of Ioannina Ioannina Greece 45110
6. University Medical Center Utrecht; Julius Center for Health Sciences and Primary Care; Room Str. 6.126 P.O. Box 85500 Utrecht Netherlands 3508 GA