A 36-year-old presents to the emergency department with upper back and neck pain after being rear-ended by another vehicle. The patient’s past medical history is significant for ankylosing spondylitis, for which he takes etanercept. On physical exam, he has tenderness to the cervical spine posteriorly, walks with a normal gait and is neurovascularly intact to the bilateral upper and lower extremities. AP and lateral radiographs of the cervical and thoracic spines show squaring of the vertebral bodies but are otherwise unremarkable. What is the best next step?