1. Department of Clinical Science University of Bergen Bergen Norway
2. Oral Health Centre of Expertise in Western Norway Bergen Norway
3. Centre for International Health, Department of Global Public Health and Primary Care University of Bergen Bergen Norway
4. Department of Clinical Dentistry University of Bergen Bergen Norway
5. Roche Product Development Shanghai Roche (China) Holding Ltd. Shanghai China
6. Department of Gynecology and Obstetrics Haukeland University Hospital Bergen Norway
7. Department of Maternal and Child Health, Gillings School of Global Public Health The University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
8. Department of Occupational Medicine Haukeland University Hospital Bergen Norway