Funding for this research was provided by:
The World Academy of Sciences (16-008 RG/CHE/AS_I – FR3240293317)
Text and Data Mining valid from 2019-02-12
Received: 10 October 2018
Accepted: 20 December 2018
First Online: 12 February 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.