1. Department of Neurosurgery, Faculty of Medicine, Airlangga University‑Dr. Soetomo General Academic Hospital, Surabaya, East Java 60286, Indonesia
2. Department of Materials and Metallurgy Engineering, Sepuluh Nopember Institute of Technology, Surabaya, East Java 60111, Indonesia
3. Department of Public Health, Faculty of Medicine, Airlangga University, Surabaya, East Java 60286, Indonesia