1. National Research Council of Italy, Institute for Research on Population and Social Policies, URT Brindisi, c/o ex Osp. Di Summa, Piazza Di Summa, 72100 Brindisi, Italy
2. National Research Council of Italy, Institute of Clinical Physiology, Unit of Lecce, c/o Ecotekne via Monteroni, 73100 Lecce, Italy
3. Tufts Medical Center, Department of Medicine, 800 Washington Street, Boston, MA 02111, USA
4. Canary Foundation of Health Research, Camino Candelaria, 44 C.S. San Isidro-El Chorrillo, 38109 El Rosario, Canary Islands, Spain
5. Scottish Medicines Consortium, Delta House, 50 West Nile Street, Glasgow G1 2NP, UK