Treatment Effect Estimation With Potential Outcomes for a Single-Arm Trial Compared With Historical Controls: A Case Study of Locally Recurrent Head and Neck Squamous Cell Carcinoma Patients Treated With Adjuvant Nivolumab. - Harun N; Sparapani R; Laud PW; Sivaganesan S; Leddon JL; Haque S; Tang AL; Wise-Draper TM (Head & neck, 2025)