1. Department of Neurology, Waikato Hospital, Hamilton 3204, New Zealand
2. Department of Radiation Oncology, Waikato Hospital, Hamilton 3204, New Zealand
3. Department of Oncology, Rotorua Hospital, Rotorua 3046, New Zealand
4. Department of Pathology, Waikato Hospital, Hamilton 3204, New Zealand
5. Midland MRI, Waikato Hospital, Hamilton 3204, New Zealand