Letter to the editor, "Validation and clinical value of the MANAGE-PD tool: A clinician-reported tool to identify Parkinson's disease patients inadequately controlled on oral medications".

The MANAGE-PD tool may help general neurologists in deciding whether a patient with advanced Parkinson's disease should be referred for an advanced therapy. Although the development and clinical validation of MANAGE-PD would appear to serve an important need, we urge the reader to be aware of several methodological concerns.