1. Department of Haematology and Bone Marrow Transplants, Hospital A. Businco, Cagliari, Italy
2. University of Coventry, Coventry, UK
3. Department of Paediatric Dentistry, Faculty of Dentistry, Hacettepe University, Ankara, Turkey
4. Department of Medical Sciences and Public Health, University of Cagliari, Monserrato, Italy
5. Division of Public Health, Health Services Research & Primary Care, Centre for Occupational and Environmental Health, University of Manchester, Manchester, UK