ผู้เขียน: Dennis Caine

Dennis Caine, Ph D, Professor Emeritus, Department of Kinesiology and Public Health Education, University of North Dakota, Grand Forks, ND, USA Laura Purcell, MSc, MD, FRCPC, Dip Sport Med Associate Clinical Professor, Department of Pediatrics Pediatric Sports Medicine Physician, David Braley Sports Medicine and Rehabilitation Center Mc Master University, Hamilton, ON, Canada Elliot Sports Medicine Clinic, Burlington, ON, Canada