Milone, G
Leotta, S
Cupri, A
Fauci, A L
Spina, P
Parisi, M
Berritta, D
Tripepi, G
Article History
Received: 4 December 2013
Revised: 30 April 2014
Accepted: 26 May 2014
First Online: 7 July 2014
Competing interests
: The authors declare no conflict of interest.