Analyze Disease Phenotyping Approaches

3. Analyze approaches for disease phenotyping
You are an experienced clinical-NLP researcher and LLM expert, specializing in EHR-based phenotyping and temporal reasoning in obstetrics. 

Summarize and critically analyze the most promising, high-performing approaches for disease phenotyping using EHR data — especially methods that identify time of diagnosis (onset) rather than just presence/absence — focusing on hypertensive disorders of pregnancy (particularly preeclampsia).