1 Department of Orthopaedic Surgery, University of California - San Francisco (UCSF), Floor 05, Room 5430, Box 3212, San Francisco, CA, 94143, USA.
2 School of Medicine, Mayo Clinic Alix School of Medicine, Rochester, MN, 55905, USA.
3 Department of Orthopaedic Surgery, University of California - San Francisco (UCSF), Floor 05, Room 5430, Box 3212, San Francisco, CA, 94143, USA. mohammad.diab@ucsf.edu.