Department of Community and Family Medicine, Duke University School of Medicine, Durham, NC, USA. Quality of Life Consulting, Durham, NC, USA. Department of Health Studies, Western Norway University of Applied Sciences, Førde, Norway. Centre of Health Research, Førde Hospital Trust, Førde, Norway. Morbid Obesity Centre, Vestfold Hospital Trust, Tønsberg, Norway. Biomedical Statistics, Neuropsychiatric Research Institute, Fargo, ND, USA. Department of Psychiatry and Behavioral Science, University of North Dakota School of Medicine and Health Sciences, Fargo, ND, USA. Health Economics and Outcomes Research, Eisai Inc., Woodcliff Lake, NJ, USA.