Rule-based natural language processing to extract clinical trial and research study enrollment history from unstructured notes. - Sergey D. Goryachev; Julie Tsu-Yu Wu; Eric Lin; Daphne R. Friedman; Robert Zwolinski; Rupali Dhond; Danne C. Elbers; Jennifer La; Cenk Yildirim; June K. Corrigan; Daniel C. R. Chen; Mary T. Brophy; et al. (Health Informatics J., 2026)