1. Department of Neurosurgery, Faculty of Medicine, Universitas Airlangga–Dr. Soetomo General Academic Hospital, Surabaya, Indonesia
2. Department of Physiology and Medical Biochemistry, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia
3. Department of Public Health and Preventive Medicine, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia