Received: 21 November 2018
Accepted: 16 June 2020
First Online: 30 June 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with animals performed by any of the authors.
: This article contains methodology that uses the data, which were collected previously in year 2011 by one of the mentioned authors Dr. Sanjay Kumar. Participants have provided written consent prior to participation. This previous study was also approved by the Local Ethics Committee of the University of Birmingham and conformed to the Declaration of Helsinki.