Received: 25 July 2017
Revised: 13 June 2018
Accepted: 21 June 2018
First Online: 5 July 2018
Compliance with ethical standards
: The authors (Prabal K. De and Nadine Shaanta Murshid) confirm that there are no known conflicts of interest associated with this publication and there has been no financial support for this work that could have influenced its outcome.
: Ethics approval was not required as the data used in this study were previously collected and are publicly available in a de-identified format.