- Dr Gaetano Serviddio, Dipartimento di Scienze Mediche e del Lavoro, Universitè di Foggia, 71100, Foggia, Italy;
- Revised 15 February 2008
- Accepted 16 February 2008
- Published in print 1 July 2008.
- Published online 16 June 2008.
- Published first 28 February 2008.
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