vii ix to extend my gratitude to the secretaries and other support staff at the Department of Demography for always being very helpful, including to Stiny, Mirjam Wempe, Eliza, and Mirjam Berghuis. My heartfelt gratitude goes to the UG library team, and specifically to Renny Oortwijn, for facilitating the payments for the open access publication of my PhD papers in journals that did not have contracts with the University of Groningen. Mirjam Berghuis, I want you to know that I will always remember and honor you for the incredible support you provided me during the final stages of my thesis. In addition, I extend my deep and sincere gratitude to Miriam Hils for editing my PhD thesis.To my fellow PhD students at the Faculty of Spatial Sciences and at other faculties of the University of Groningen, I thank you all for your warmth, friendship, support, encouragement, extended invitations for lunches and dinners, and scientific discussions about our projects. I am especially indebted to Chumki, Dr.