1. Department of Public Health and General Practice; Faculty of Medicine; Norwegian University of Science and Technology; Trondheim Norway
2. Department of Epidemiology and Biostatistics; School of Public Health; Imperial College London; London UK
3. Bjørknes University College; Oslo Norway
4. Section of Obstetrics; Division of Obstetrics and Gynaecology; Rikshospitalet; Oslo University Hospital; Oslo Norway
5. Department of Pediatric Research; Rikshospitalet; Oslo University Hospital; University of Oslo; Oslo Norway
6. Department of Preventive Cardiology; Oslo University Hospital; University of Oslo; Oslo Norway