Article History
Received: 7 July 2018
Accepted: 14 September 2018
First Online: 20 September 2018
Compliance with ethical standards
:
: Since the present study is an observational study as it involved the use of public access data only, there is no need for approval of the ethics committee.
: The authors declare that they have no conflict of interest.
: Since the present study is an observational study as it involved the use of public access data only, there is no need for informed consent.