1Department of Internal Medicine, Hospital del Mar-IMIM, Autonomous University of Barcelona and RETICEF, Instituto Carlos III, Spain
2Center for Advanced Orthopedic Studies, Beth Isreal Deaconess Medical Center and Department of Orthopedic Surgery, Harvard Medical School, Boston, MA, USA
3Dept. of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Oslo, Norway
4Division of Endocrinology and Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
5Department of Orthopaedic Surgery and Rehabilitation, Vanderbilt University Medical Center, Nashville, TN, USA
6Center for Bone Quality, Leiden University Medical Center, Leiden, The Netherlands
7Department of Orthopaedic Surgery, Washington University in St Louis, St Louis, MO, USA