Het onderzoek of ontwerp dat in dit proefschrift wordt beschreven is uitgevoerd in overeenstemming met de TU/e Gedragscode Wetenschapsbeoefening. First, I would like to thank my supervisors Daniel J. Bernstein and Tanja Lange for giving me the chance to work with them. Dan offered me the freedom to work on what I found interesting, and I really appreciate all the suggestions and comments he gave me during our discussions. Tanja always tries to give me reasons to feel more confident in myself

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... has always been helpful and supportive in many different ways. Most of my papers are joint work with others, and therefore I would like to thank my coauthors