COVID-19 SignSym: a fast adaptation of a general clinical NLP tool to identify and normalize COVID-19 signs and symptoms to OMOP common data model - Wang, Jingqi; Abu-El-Rub, Noor; Gray, Josh; Pham, Huy Anh; Zhou, Yujia; Manion, Frank; Liu, Mei; Song, Xing; Xu, Hua; Rouhizadeh, Masoud; Zhang, Yaoyun (ArXiv.org, 2020)