Text and Data Mining valid from 2019-11-18
Received: 19 August 2019
Revised: 5 November 2019
Accepted: 6 November 2019
First Online: 18 November 2019
Compliance with Ethical Standards
: Manoj Gupta, Partha Sarathi Choudhury, Sudhir Rawal, G. Karthikeyan, Vineet Talwar, Kumar Deep Dutta and Amitabh Singh declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The institutional review board waived the need to obtain informed consent for this retrospective study.