- Correspondence to Dr Andrea Farioli, Department of Medical and Surgical Sciences (DIMEC), University of Bologna, UO Medicina del Lavoro – Pad 1, Sant'Orsola Malpighi University Hospital via Palagi 9, 40138 Bologna, Italy ;
- Received 28 October 2016
- Revised 30 January 2017
- Accepted 6 February 2017
- Published online 9 March 2017.
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