Document is current

Article History

Received: 21 July 2017

Accepted: 6 February 2018

First Online: 15 February 2018

Ethics approval and consent to participate

: The study was approved and authorized by the hospital’s ethical committee (St. Luke’s International Hospital). Ethical approval number: 16-J002.

: Not applicable.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.