Acknowledgments

I want to thank my mentor, Dr. Pradeep Korgaonkar, for his support and encouragement regarding my research work. I am grateful to my husband Viorel, for being there for me and for his help and ideas. I also want to express my gratitude to my parents, Rodica and Ioan Petrescu, and my grandmother, Ileana Ciresan, for everything they have done for me. Special thanks to my son, Dan, for being nice and letting mommy work. Last, but not least, many thanks to my great editor, Dr. Victoria Crittenden.

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