Received: 19 May 2019
Accepted: 30 September 2019
First Online: 15 October 2019
Ethics approval and consent to participate
: The present study was carried out in accordance with the Declaration of Helsinki, modified Tokyo 2004, and was approved by the Institutional Review Board (IRB) of Policlinico Tor Vergata University Hospital (protocol number: R.S. 64/15). All samples were obtained only after written informed consent, signed by the patients and the M.D.
: Not applicable.
: The authors declare that they have no competing interests.