- Correspondence to Professor Pierluigi Cocco, Department of Public Health, Occupational Health Section, University of Cagliari, Asse Didattico – Policlinico Universitario, SS 554, km 4,500, 09042 Monserrato (Cagliari), Italy;
- Received April 18, 2012
- Revised August 28, 2012
- Accepted September 30, 2012
- First published November 1, 2012.
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