1. PharmacoEpidemiology and Drug Safety Research Group Department of Pharmacy, and PharmaTox Strategic Research Initiative Faculty of Mathematics and Natural Sciences University of Oslo Oslo 0316 Norway
2. Department of Mental Disorders Norwegian Institute of Public Health Oslo 0213 Norway
3. Department of Psychology PROMENTA Research Centre University of Oslo Oslo Norway
4. Institute of Clinical Medicine University of Oslo Oslo Norway
5. Department of Child Health and Development Norwegian Institute of Public Health Oslo 0213 Norway