The need for routine preoperative coagulation screening tests (prothrombin time PT/partial thromboplastin time PTT) for healthy children undergoing elective tonsillectomy and/or adenoidectomy - Asaf, T; Reuveni, H; Yermiahu, T; Leiberman, A; Gurman, G; Porat, A; Schlaeffer, P; Shifra, S; Kapelushnik, J (Int J Pediatr Otorhinolaryngol, 2001)