1. Department of Global Public Health and Primary Care; University of Bergen; Bergen Norway
2. Department of Pediatrics; Haukeland University Hospital; Bergen Norway
3. Department of Medical Science; University of Bergen; Bergen Norway
4. Department of Heart Disease; Haukeland University Hospital; Bergen Norway
5. Norwegian Institute of Public Health; Bergen Norway
6. Norwegian Institute of Public Health; Oslo Norway
7. Center for Medical Genetics and Molecular Medicine; Haukeland University Hospital; Bergen Norway