1. Division of Internal and Cardiovascular Medicine, University of Perugia, Perugia, Italy
2. Department of Surgical Sciences, University Hospital, Uppsala, Sweden
3. Department of Medicine, Guy's, King's and St Thomas' School of Medicine, Academic Department of Surgery, London, UK
4. Department of Haematology, Flinders Medical Centre, Adelaide, South Australia, Australia
5. McMaster University, Hamilton, Ontario, Canada