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1 Department of Orthopaedic Surgery, Division of Physical Medicine and Rehabilitation, Stanford University, Redwood City, CA, USA. Electronic address: mfred2@stanford.edu.
2 Department of Physical Medicine and Rehabilitation, Harvard Medical School, Spaulding Rehabilitation Hospital, Spaulding National Running Center, 1575 Cambridge Street, Cambridge, MA 02138, USA. Electronic address: tenforde@stanford.edu.
1 Department of Orthopaedic Surgery, Division of Physical Medicine and Rehabilitation, Stanford University, Redwood City, CA, USA. Electronic address: mfred2@stanford.edu.
2 Department of Physical Medicine and Rehabilitation, Harvard Medical School, Spaulding Rehabilitation Hospital, Spaulding National Running Center, 1575 Cambridge Street, Cambridge, MA 02138, USA. Electronic address: tenforde@stanford.edu.