1. a Department of Physical Medicine & Rehabilitation, Department of Veterans Affairs , Northern California Health Care System , Sacramento , California , USA
2. b Department of Physical Medicine & Rehabilitation , University of California Davis Medical Center, Sacramento , Sacramento , California , USA
3. c Department of Family Medicine , Loyola Stritch School of Medicine , Maywood , Illinois , USA
4. d Exercise Science Program , Oakland University , Rochester , Michigan , USA
5. e Health Sciences Department , Gettysburg College , Gettysburg , Pennsylvania , USA