To Elin and Hjalmar My son Hjalmar is acknowledged for all those times he pushed me into taking a nightly walk with him to clear my mind, and the times he got me to wake up, even if I just wanted to lay in bed a little longer. However, even if you are just about 1 year old at the time I write this, I want you to know that it was a joy coming home to your smile during the time of writing this thesis, it gave me much needed energy.Last but not least, I would like to thank my wife Elin, for being there by my side all the way, and I would not have made it without her love and support. I love you.