There are many patients who complain of chronic pain. Some of them are difficult to treat with Western medicine. Because they have been suffering from severe pain for a long time, they complicate other disorders such as sleeplessness,..

There are many patients who complain of chronic pain. Some of them are difficult to treat with Western medicine. Because they have been suffering from severe pain for a long time, they complicate other disorders such as sleeplessness,..
Epidural opioids are widely used in the management of postoperative pain. On the basis of an extensive review of the literature, the authors here present their own interpretation of current knowledge of how the distribution and effectiveness of..