1. Department of Internal Medicine and Cardiology; Charité-Universitätsmedizin Berlin; Berlin Germany
2. Clinical Research Unit; Istituto Auxologico Italiano; University of Milan-Bicocca; Meda Italy
3. Department of Health Science; University of Milano-Bicocca; Milano Italy
4. Department of Clinical Sciences and Community Health; Fondazione Ospedale Maggiore Policlinico di Milano; University of Milano; Milano Italy