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    • Wu, Patrick; Gifford, Aliya; Meng, Xiangrui; Li, Xue; Campbell, Harry; Varley, Tim; Zhao, Jaun; Carroll, Robert; Bastarache, Lisa; Denny, Joshua C.; Theodoratou, Evropi; Wei, Wei-Qi (JMIR Medical Informatics, 2019)
      Background: The phecode system was built upon the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) for phenome-wide association studies (PheWAS) using the electronic health record ...