NICE guidance on deep brain stimulation
BMJ Group Medical Reference
The National Institute for Health and Clinical Excellence (NICE), the government body that decides which treatments should be available on the NHS, says that when doctors use deep brain stimulation for people with Parkinson's disease they should: 
Make sure you understand the benefits and risks
Only do the operation when drug treatment isn't working any more
Treat you within a team of doctors and other health professionals with a range of different skills in a hospital department called a neuroscience unit. A doctor specialising in diseases that affect the nerves (a neurologist), a brain surgeon (neurosurgeon), and psychologists should be included in the team
Monitor the results of your surgery.
A neurologist is a doctor who specialises in diseases that affect your brain and your nervous system.
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