PTH and concussion: We aimed to thoroughly identify potential risk factors for acute PTH (aPTH) and further pPTH in mTBI patients by utilizing the Rivermead Post Concussion Symptom Questionnaire (RPQ) [21], Structured Clinical Interview for DSM-IV Axis I disorders (SCID-I) [22], and patient records from the emergency department (ED) and clinical neurology outpatient visits within one year’s follow-up.