1. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway/Norwegian Multiple Sclerosis Competence Centre, Department of Neurology, Haukeland University Hospital, Bergen, Norway
2. Partners Multiple Sclerosis Center, Brigham and Women’s Hospital, Boston, MA, USA
3. Departments of Nutrition and Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA/Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, USA
4. Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA, USA