- Correspondence to Dr Giovanni Barbara, Department of Medical and Surgical Sciences, St. Orsola-Malpighi Hospital—Building # 5, Via Massarenti, Bologna 9-I-40138, Italy;
- Received 2 August 2014
- Revised 18 November 2014
- Accepted 20 November 2014
- Published in print 1 January 2016.
- Published online 8 December 2015.
- Published first 22 December 2014.
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