Article History
Received: 14 January 2019
Accepted: 24 June 2019
First Online: 3 July 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.
: This article does not contain any studies with human participants performed by any of the authors.
: For this type of study, formal consent is not required. The requirement for informed consent was waived due to the retrospective nature of this study.