1. Department of Medical Biosciences, Umea University, Umea, Sweden
2. RECAMO, Masaryk Memorial Cancer Institute, Zluty kopec 7, 656 53 Brno, Czech Republic
3. Department of Neuroscience Reproductive and Dentistry Sciences, University of Naples Federico II, Naples, Italy
4. Department of Medical, Surgical and Dental Specialties, Second University of Naples, Multidisciplinary Naples, Italy
5. Department of Clinical Sciences/ENT, Umea University, Umea, Sweden
6. Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy
7. Dipartimento Universitario di Anatomia Patologica, Seconda Universita` Degli Studi di Napoli, Piazza Miraglia, Naples, Italy
8. Department of Odontology, Umea University, Umea, Sweden