Search strategy
| Item | Search term | Boolean operator |
| Tremor | (‘tremor*’[All Fields] OR ‘tremor*’ [MeSH Terms], ‘shaking’ [All Fields] OR ‘shaking’ [MeSH Terms]) | AND |
| Lesion | (‘lesion*[All Fields] OR ‘lesion*’ [MeSH Terms], ‘thalamotomy’ [All Fields] OR ‘thalamotomy’ [MeSH Terms], ‘subthalamotomy’ [All Fields] OR ‘subthalamotomy’ [MeSH Terms], ‘pallidotomy’ [All Fields] OR ‘pallidotomy’ [MeSH Terms], | AND |
| Neurosurgery | (‘neurosurg*’[All Fields] OR ‘neurosurg*’ [MeSH Terms]) | AND |
| Time period | Between 1 January 1990 and 1 February 2017 |