1. Orthopedics, Mayo Graduate School of Medicine, Rochester, Minnesota.
2. Department of Orthopedics, Mayo Clinic and Mayo Foundation; and Assistant Professor of Orthopedics, Mayo Medical School; Rochester, Minnesota.
3. Section of Biostatistics, Mayo Clinic and Mayo Foundation.
4. Section of Biostatistics, Mayo Clinic and Mayo Foundation, and Assistant Professor of Biostatistics, Mayo Medical School.