1. Department of Public Health, Comparative Pathology, and Veterinary Hygiene, University of Padova, 35020 Legnaro, Italy
2. Centro de Ciencias de Mar, Universidade do Algarve, 8000-810 Faro, Portugal
3. Hellenic Center for Marine Research, 71003 Crete, Greece
4. Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece and
5. Department of Biology, University of Padova, 35121 Padova, Italy