“…Compared to text categorization, information extraction focuses on specific information elements found in clinical text. This includes cancer stage in patients with lung cancer [62], average weekly doses of drugs [63], adverse events in robotic surgery [64], indwelling urinary catheter and urinary symptoms [65], liver tumor characteristics from radiology reports [66], left ventricular ejection fraction from echocardiography reports [67], wound information (wound type, pressure ulcer stage, wound size, anatomic location, and wound treatment) from free text clinical notes [39], and congestive heart failure medication information from Veteran Administration EHRs [68]. Clinical trials attract much attention for tasks that require specific information extraction for public health research, including comparative effectiveness research [69], mapping of disease research [70], categorizing adverse events by age and type [71], or characterizing cancer drug toxicity [72].…”