1. Department of Forest Therapy, Graduate School of Chungbuk National University, Cheongju, Korea.
2. Korea Forest Welfare Institute, Forest Welfare Research Center, Daejeon, Korea.
3. Department of Pharmacy, Korea University Anam Hospital, Seoul, Korea.
4. Geriatric Health Institute, Korea University College of Medicine, Seoul, Korea.
5. Department of Neurology, Korea University Anam Hospital, Seoul, Korea.