1. Department of Exercise Science, California Lutheran University, 60 W. Olsen Road, #3400, Thousand Oaks, CA 93065, USA
2. Department of Preventive Medicine, Keck School of Medicine, University of Southern California, CA 90033, USA
3. Division of Biokinesiology and Physical Therapy, School of Dentistry, University of Southern California, CA 90089, USA
4. School of Psychological Sciences and Health, Strathclyde University, Glasgow Scotland, G1 1QX, UK