By Neil Bowdler Health reporter, BBC News
A doctor examines the hands of a man with Parkinson's disease
An international study has linked an industrial solvent to Parkinson's disease.
Researchers found a six-fold increase in the risk of developing Parkinson's in individuals exposed in the workplace to trichloroethylene (TCE).
Although many uses for TCE have been banned around the world, the chemical is still used as a degreasing agent.
The research was based