Ai Seon Kuan1,2, Tzeng-Ji Chen2,3,4. 1. Division of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan, ROC. 2. School of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC. 3. Department of Family Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, ROC. 4. Big Data Center, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.