I am grateful to my supervisors Karl-Olof Bergman and Per Milberg for all their support. I also thank Heidi Paltto for invaluable help with analyses and comments on the manuscript.

Margareta Edqvist, Niklas Johansson, Carl-Cedric Coulianos, Tommy Karlsson, Jan Landin, Hasan Dzuho and Mattias Jonsson all deserve thanks for sharing their expertise.

Stiftelsen Oscar och Lili Lamms minne and Wala och Folke Danielssons fond supported this work financially.