Department of Anesthesiology;
Shiga University of Medical Science Hospital;
Otsu;
Japan;
Department of Psychosomatics;
Shiga University of Medical Science Hospital;
Otsu;
Japan;
Pain Management Clinic;
Department of Anesthesiology;
Shiga University of Medical Science Hospital;
Otsu;
Japan;
Magnetic; Resonance; Spectroscopy; Chronic; Pain; Anterior; Cingulated; Cortex; N-Acetylaspartate;