Supplemental Material for
Identifying Opioid Relapse During COVID-19 Using Natural Language Processing of Nationwide Veterans Health Administration Electronic Medical Record Data
Nicholas A. Livingston 
, Amar D. Mandavia, Anne N. Banducci, Rebecca Sistad Hall, Lauren B. Loeffel, Michael Davenport, Brittany Mathes-Winnicki, Maria Ting, Clara E. Roth, Alexis Sarpong, Noam Newberger, Zig Hinds, Jennifer R. Fonda, Daniel Chen, and Frank Meng Journal of Psychopathology and Clinical Science,
Vol.
134,
No.
4,
pp.
448–457
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