Text and Data Mining valid from 2018-08-28
Received: 24 January 2018
Accepted: 17 August 2018
First Online: 28 August 2018
Ethics approval and consent to participate
: This study was conducted in accordance with the Helsinki Declaration and approved by the Research Ethics Committee and Research Advisory Council (RAC # 2091 051). Consent was waived by IRB as the study was a retrospective study.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.