1. 1Division of Biokinesiology & Physical Therapy, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, USA
2. 2Division of Biostatistics, Department of Preventive Medicine, University of Southern California, Los Angeles, CA, USA
3. 3Department of Physical Therapy, School of Rehabilitation Sciences, Niigata University of Health and Welfare, Niigata, Japan