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Funnel plots displaying inter-hospital variations in (A) resection rates within 6 months from radiological diagnosis adjusted for age in years, Karnofsky performance status score and year of surgery, (B) early postoperative radiotherapy plus PCV (procarbazine, lomustine, vincristine) adjusted for age in years, Karnofsky performance status score, year of surgery and primary surgical intervention (initial biopsy only vs primary resection).
