1. Department of Clinical Medicine University of Bergen Bergen Norway
2. Department of Neurology Haukeland University Hospital Bergen Norway
3. Department of General Practice HELSAMUniversity of Oslo Oslo Norway
4. Department of Neurology Akershus University Hospital Lørenskog Norway
5. Department of Neurology St. Olav's University Hospital Trondheim Norway
6. Department of Neuromedicine and Movement Science Norwegian University of Science and Technology Trondheim Norway
7. PharmacoEpidemiology and Drug Safety Research Group Department of Pharmacy University of Oslo Oslo Norway
8. Department of Child Health and Development National Institute of Public Health Oslo Norway