Mild traumatic brain injury(mTBI) is a common cause of consultation to the emergency rooms worldwide and is the most common form of traumatic brain injury. Though classified as mild, as many as 40% of patients suffering mTBI do not make complete recoveries or present persistent symptoms. The present study is intended to determine long term outcome of patients suffering mTBI and to establish new prognostic models with the use of serum and saliva based biomarkers. For this purpose this study will not exclude patients regarding their comorbidities.