1. Service of Biometry & Statistics; IRCCS Fondazione Policlinico S Matteo; Pavia Italy
2. Cardiology Department; University of Modena and Reggio Emilia, Policlinico di Modena; Modena Italy
3. Cliniques du Sud Luxembourg; Arlon Belgium
4. Karolinska University Hospital; Stockholm Sweden
5. Centre for Scientific Documentation; IRCCS Fondazione Policlinico S Matteo; Pavia Italy
6. Aston Medical Research Institute, Aston Medical School; Aston University; Birmingham UK