Article History
Received: 29 January 2018
Revised: 29 May 2018
Accepted: 31 May 2018
First Online: 14 June 2018
Compliance with ethical standards
:
: All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.
: For this type of study, ethical approval is not required.
: For this type of study, formal consent is not required.