- Correspondence to Dr Enrico Valerio, Department of Woman and Child Health, Medical School, University of Padua, Via Giustiniani, 3, Padova (PD) 35128, Italy;
- Received 24 May 2015
- Revised 29 June 2015
- Accepted 4 July 2015
- Published online 14 December 2015.
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