Rehabilitation Medicine: includes efforts to improve function and minimize impairment related to activities that may have been hampered by illnesses or injuries. Disabling conditions such as stroke, traumatic brain injury, and cerebral palsy, as well as musculoskeletal issues and pain, may require various levels of rehabilitation medicine. The World Health Organization defines “rehabilitation research” as the study of mechanisms and interventions that prevent loss of function or improve, restore, or replace lost, underdeveloped, or deteriorating function.