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Kaplan–Meier curves for disease-specific survival in patients with (a) tumour stage Ia (T1a) (P = 0.614) and (b) tumour stage Ib (T1b) (P = 0.0002) gallbladder carcinoma, by type of surgery. C + LN, cholecystectomy plus lymph node resection; RC, radical cholecystectomy
