1. Department of Neurosurgery, Osaka International Cancer Institute, 3‑1‑69 Otemae, Chuo‑ku, Osaka 541‑8567, Japan
2. Department of Neurosurgery, Kawachi General Hospital, 1‑31 Yokomakura, Higashiosaka, Osaka 578‑0954, Japan
3. Department of Diagnostic and Interventional Radiology, Osaka International Cancer Institute, 3‑1‑69 Otemae, Chuo‑ku, Osaka 541‑8567 Japan
4. Department of Breast and Endocrine Surgery, Osaka International Cancer Institute, 3‑1‑69 Otemae, Chuo‑ku, Osaka 541‑8567 Japan
5. Department of Neurosurgery, Osaka University Graduate School of Medicine, 2‑2 Yamadaoka, Suita, Osaka 565‑0871, Japan