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15 - Muacevic A, Kreth FW, Horstmann GA, Schmid-Elsaessr R. Wowra B, Steiger HJ. Reulen HJ. Surgery and radiotherapy compared with gamma knife radiosurgery in the treatment of solitary cerebral metastases of small diameter: J Neurosurg 1999 Jul; 91(1):35-43.