1. Department of Neurology, Hanyang University Hospital, Seoul, Korea.
2. Society for Cognitive Intervention, Seoul, Korea.
3. Department of Psychiatry, Yeouido St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Department of Psychiatry, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
5. Forest Welfare Research Center, Korea Forest Welfare Institute, Yeongju, Korea.
6. Department of Neurology, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea.