Article History
Received: 19 January 2018
Accepted: 4 May 2018
First Online: 21 May 2018
Compliance with ethical standards
: The study herein presented was approved by the local review board and performed in accordance with the principles of good clinical practice, with the Declaration of Helsinki, and with the national regulations regarding clinical trials. Waivers of informed consent and authorization were granted for the retrospective analysis.
: The authors have declared no conflicts of interest.