1. Department of Psychiatry; Inha University Hospital; Incheon; Korea
2. National Cancer Center; Goyang; Korea
3. Gwangju Inkwang Dementia Hospital; Gwangju; Korea
4. Department of Psychiatry; Kyungpook National University; Daegu; Korea
5. Department of Psychiatry; Inje University College Of Medicine; Seoul; Korea
6. Department of Psychiatry; Seoul National University Hospital; Seoul; Korea