1. Department of Medicine and Surgery, Dental School, University of Parma, Via Gramsci 14, 43126 Parma, Italy
2. Private Practice, Via Vittorio Veneto 99, 19121 La Spezia, Italy
3. Private Practice, Piazza di Porta Mascarella 7, 40126 Bologna, Italy
4. Private Practice, Via Ridolfino Venuti 38, 00162 Roma, Italy