Article History
Received: 8 January 2018
Accepted: 23 January 2018
First Online: 30 January 2018
Compliance with ethical standards
:
: None.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.
: For this type of study, formal consent is waived.