Medical psychologists are specialists in psychological and behavioral aspects of physical illness and have additional advanced training in psychopharmacology, physiology, and rehabilitation. Their clinical tools include assessment in general and specialist medicine (e.g., chronic illness management, pain treatment, brain injury), clinical psychophysiology (eg, biofeedback), psychotherapy, hypnosis, behavioral medicine, and psychosocial interventions; they are licensed to prescribe medication in certain countries. They tend to work in hospitals and private practice. The specialty is not recognized in all countries.