- Correspondence to Professor Giancarlo Troncone, Department of Public Health, University of Naples Federico II, via Sergio Pansini 5, I-80131, Naples, Italy;
- Received 23 April 2015
- Revised 16 May 2015
- Accepted 18 May 2015
- Published in print 1 September 2015.
- Published online 18 August 2015.
- Published first 5 June 2015.
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