i The Effect of a Self-Efficacy Enhancing Education Program on Family Caregivers’ Competencies in Caring for Patients with Mild Traumatic Brain Injury in Yogyakarta, Indonesia Erfin Firmawati A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Nursing Science (International Program) Prince of Songkla University 2013 Copyright of Prince of Songkla University