Pengaruh pemberian Cognitive Behaviour Therapy (CBT) terhadap perubahan tanda dan gejala serta kemampuan mengatasi Post Traumatic Stress Disorder (PTSD) pasca erupsi Merapi = Effects of Cognitive Behavior Therapy (CBT) on changes in signs and symptoms and ability to overcome Post Traumatic Stress Disorder (PTSD) post Merapi eruption