1. Department of Epidemiology, Fielding School of Public HealthUniversity of CaliforniaLos Angeles, Los Angeles California USA
2. Department of Nutrition, Faculty of MedicineUniversity of OsloOslo Norway
3. UCLA Center for Health Policy ResearchUniversity of California, Los AngelesLos Angeles California USA
4. California Center for Population ResearchUniversity of CaliforniaLos Angeles, Los Angeles California USA
5. Department of Community Medicine and Global Health, Institute of Health and SocietyUniversity of OsloOslo Norway
6. Division of Epidemiology, Norwegian Institute of Public HealthOslo Norway
7. Division for Mental and Physical Health, Norwegian Institute of Public HealthOslo Norway