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Preoperative investigations in elective surgery: practices and costs at the National Hospital of Sri Lanka Ranasinghe, P; Research Associate, Diabetes Research Unit, Department of Clincal Medicine, Faculty of Medicine, University of Colombo, Sri Lanka - Perera, YS; Research Assistant, Department of Clincal Medicine, Faculty of Medicine, University of Colombo, Sri Lanka - Abayadeera, A; Senior Lecturer, Department of Surgery, Faculty of Medicine, University of Colombo, Sri Lanka
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