Samer S. Hoz To my lovely family: Sawsan, Saad, Arwa, Farah, Ward, Khawla, Samhar, Sanaa, Faris, and Luay. To the GYL team, Norberto, Kathi, and Paolo. Abdullah H. Al Ramadan To my Mom Layla (May Allah bless her soul) and my Dad Husain, To My love Rahmah, my daughters Sara and Sama and my supportive family: Ali, Mohammed, Ahmed, Zainab, Sara and Jawad. Ian Pople To my wonderful neurosurgical team and supporting staf at Sidra Medicine, Doha. Nada Mohammed To my parents, brothers and sister. To my friends Osilat, Ghada and Kholood for their unstoppable support. Waeel O. Hamouda To my patients who courageously endure the dismay and hardship of their diseases while trusting me with their lives and dreams. You are all my heroes. Ahmed El Damaty To my family and patients, whom their trust endeavored me on that long tedious way. Mustafa Ismail To my mom Khafa, to my dad Ismail (May Allah bless his soul), to my sister Noor, to brothers Osama and Qutaiba, my family