1Division of Health Examination Statistics, National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland, US
2Diagnostic Radiology, Mayo Clinic and Foundation, Rochester, Minnesota, US
3Center for Food Safety and Applied Nutrition, Food and Drug Administration, Washington, DC, US
4National Institute on Aging, National Institutes of Health, Bethesda, Maryland, US
5National Institute of Arthritis, Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland, US
6Indiana University Medical Center, Indiana University, Indianapolis, Indiana, US
7Regional Bone Center, Helen Hayes Hospital, West Haverstraw, New York, USA, US