Acknowledgements

We would like to thanks to Prof. Olivier Wenker, CEO of Internet Journal of Publications to granted permission for including in this chapter some figures and tables published online by the before-mentioned editorial house.

Parts of this chapter are taken from the authors' former work. In this regards we also want to acknowledge to following sources:


One of the article was published by IJN and co-authored by Prof. H Foyaca who is also an Editor-in-Chief of the IJN. The other two sources were properly cited in the body of this chapter and the reference list. We also declare that we have not conflict of interest.
