[1] Norwegian University of Science and Technology,Department of Public Health and Nursing, Faculty of Medicine and Health Sciences
[2] Center for Oral Health Services and Research (TkMidt),Department of Epidemiology and Biostatistics, School of Public Health
[3] Imperial College London,Department of Nutrition
[4] Oslo New University College,Department of Endocrinology, Morbid Obesity and Preventive Medicine
[5] Oslo University Hospital Ullevål,undefined