| Abbreviation | Meaning |
| CI | confidence interval |
| COMT | catechol-O-methyltransferase |
| JBI | Joanna Briggs Institute |
| LCIG | levodopa–carbidopa intestinal gel |
| LECIG | levodopa-entacapone-carbidopa intestinal gel |
| NCS | nerve conduction studies |
| PN | peripheral neuropathy |
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