a1 CNR Institute of Clinical Physiology, Via Savi 8, 56126 Pisa, Italy
a2 Centre for Diabetes and Cardiovascular Risk, University College London Medical School, Whittington Hospital, London N19 3UA
a3 Department of Internal Medicine, Ruperto-Carola University, Heidelberg, Germany
a4 Department of Medicine, Geneva University Hospital, Geneva, Switzerland
a5 Second Department of Internal Medicine, Propaedeutic, Athens University, Athens, Greece
* For details, see Appendix.