Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, NEO, Blickagången 16, Huddinge, 141 52, Stockholm, Sweden. hong.xu.2@ki.se. Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, NEO, Blickagången 16, Huddinge, 141 52, Stockholm, Sweden. Theme Aging, Karolinska University Hospital, Stockholm, Sweden. Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden. Department of Clinical Science, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden. Department of Renal Medicine, Karolinska University Hospital, Stockholm, Sweden. Clinical Nutrition and Metabolism, Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden. Department of Geriatrics, Capio Geriatrik Nacka AB, Nacka, Sweden.