Technical aspects, safety, and learning curve of laparoscopic cholecystectomy using a reusable bipolar clamp: a risk-adjusted cusum analysis of 780 cases operated by surgical trainees - Widyaningsih, R; Ghamarnejad, O; Kardassis, D; Javaheri, H; Gharbi, A; Stavrou, G A (Zeitschrift für Gastroenterologie, 2025)