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2Heikkila R, Heilo A, Anna E, et al. Testicular ultrasonography and 18 G biopsy for clinically undetected cancer or carcinoma in situ in patients with germ cell tumours. Br J.Urol 1993;71(2) :214
2Heikkila R, Heilo A, Anna E, et al. Testicular ultrasonography and18G biopsy for clinically undetected cancer or carcinoma in situ in patients with germ cell tumours. BrJ. Urol, 1993; 71 (2): 214