1 Department of Orthopaedic Surgery, University of California San Francisco, San Francisco, California.
2 Department of Kinesiology and Nutrition, University of Illinois, Chicago, Illinois.
3 Orthopaedic Research Society, Rosemont, Illinois.
4 Nancy E. and Peter C. Meinig School of Biomedical Engineering and Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York.
5 Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, New York City, New York.
6 Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, Michigan.
7 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana.
8 Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
9 Department of Orthopaedics and Rehabilitation, The University of New Mexico Health Sciences Center, Albuquerque, New Mexico.
10 Department of Bioengineering, Temple University, Philadelphia, Pennsylvania.
11 Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia.
12 Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, Ohio.
13 Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota.