Article History
Received: 30 December 2017
Accepted: 19 September 2018
First Online: 3 October 2018
Ethics approval and consent to participate
: This study was except from formal ethical approval from the research ethics committee as it did not involve the use of identifiable patient information or data.
: N/A
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.