A Case Demonstration of the Open Health Natural Language Processing Toolkit From the National COVID-19 Cohort Collaborative and the Researching COVID to Enhance Recovery Programs for a Natural Language Processing System for COVID-19 or Postacute Sequelae of SARS CoV-2 Infection: Algorithm Development and Validation. - Wen A; Wang L; He H; Fu S; Liu S; Hanauer DA; Harris DR; Kavuluru R; Zhang R; Natarajan K; Pavinkurve NP; Hajagos J; et al. (JMIR medical informatics, 2024)