1. Department of Nutrition; Institute of Basic Medical Sciences; University of Oslo; Oslo Norway
2. Department of Human Nutrition and Home Economics; Kyambogo University; Kampala Uganda
3. Institute of Clinical Dentistry; Faculty of Dentistry; University of Oslo; Oslo Norway
4. Oslo Center for Biostatistics and Epidemiology; Oslo University Hospital; Oslo Norway
5. Institute of Health Sciences; Kristiania University College; Oslo Norway
6. Department of Haematology; Oslo University Hospital; Oslo Norway