1Orthopaedics Department, University of Iowa College of Medicine, 200 Hawkins Drive, Iowa City, Iowa 52246
2Laboratory for the Study of Skeletal Disorders and Rehabilitation, Children’s Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, Massachusetts 02115
3Creighton Osteoporosis Center, Creighton University School of Medicine, 600 North 30th Street, Omaha, Nebraska 68131