**Notes/thanks/other declarations**

Yousef Najajreh would like to express his special thanks, gratitude and truthful appreciation to my dearest family: my wife Muna, my two daughters Aseel and Layan and my two sons Mulham and Majd for all the love, compassion, and support received from them all along.

This chapter is dedicated to the respectable memories of my mother Jaleelah and my father Salem who passed a way of old age and to the reminiscence of my dearest brothers Mohammed, Iqab and my sister Zahra who left us to a better world. Peace Be Upon Them All.

Maha Awwad-Khoury would like to express special thanks my family as a whole for their support and love. I would like also to extend my sincere gratitude to my supervisor Dr. Yousef Najajreh for giving me the opportunity to participate in the research. It was a great privilege and honor for me.
