Norwegian Institute of Public Health, Oslo, Norway, Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Oslo, Norway, Faculty of Medicine, University of Oslo, Oslo, Norway Norwegian Institute of Public Health, Oslo, Norway Norwegian Institute of Public Health, Oslo, Norway, Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Oslo, Norway Norwegian Institute of Public Health, Oslo, Norway.