Text and Data Mining valid from 2019-02-15
Received: 9 September 2018
Accepted: 9 January 2019
First Online: 15 February 2019
Ethics approval and consent to participate
: This retrospective study is approved by the Ethics board committee of Theptarin Hospital (No.07/2017). No inform consent to participant was required as a retrospective study.
: 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.