1. Yannis Alamanos, Department of Social Medicine, University of Crete, Greece
2. Kiki Tsamandouraki, Department of Social Medicine, University of Crete, Greece, For correspondence: Dr. Kiki Tsamandouraki Department of Social Medicine University of Crete P.O. Box 1393 Iraklio, Crete, Greece Tel. (081) 261970–7 Fax (081) 262674
3. Antonis Koutis, Department of Social Medicine, University of Crete, Greece
4. Michael Fioretos, Department of Social Medicine, University of Crete, Greece