A system for de-identifying medical message board text

BMC Bioinformatics

Table 1 Word lists used to generate features

Dictionary	Source
Proper name	Natural language toolkit [18] and Deid system [9, 16]
Common word	Ispell, GNU spell-checker dictionary; inspired by Thomas et al. [8]
Stop word	Generic list of very common English words
Medical word	Deid system lexicon [9, 16]
Drug word	Generated from the Cerner Multum Drug Lexicon, (Denver, CO)
Honorific	Compiled by hand (e.g., mr., mrs, dr.)
All user	Users that have posted to this message board, generated from “author” field of each message
User variant	Users who have posted to this particular thread, with variants of these names derived automatically (strip digits, split by delimiters/camel case/known names and words)

ISSN: 1471-2105