1. Department of Neurosurgery, Faculty of Medicine, Universitas Padjadjaran - Dr. Hasan Sadikin Hospital, Bandung, West Java,
2. Department of Neurosurgery, Faculty of Medicine, Universitas Sam Ratulangi – Prof. Dr. R.D. Kandou Hospital, Manado, North Sulawesi,
3. Department of Neurosurgery, Faculty of Medicine, Airlangga University, Surabaya, East Java, Indonesia.