Acknowledgments
Rajan Patel acknowledges Science and Engineering Research Board and University Grant Commission New Delhi for providing research grant with Sanction Order No. SR/S1/PC-19/2011, SB/EMEQ-097/2013 and F.No.39-841/2010 (SR), respectively. Neeraj Dohare thanks to UGC for providing the RGNF with sanction order No. F117.1/ 2015-16/ RGNF 2015-17-SC-UTT-17986. Dr Abbul Bashar Khan is thankful to Science and Engineering Research Board (SERB), New Delhi for providing research grant with Sanction Order No. SB/FT/CS- 031/2013. Authors also thanks to DST for providing the FIST grant with Sanction Order No. SR/FIST/LSI-541/2012.
Disclosure statement
No potential conflict of interest was reported by the authors.