1. Institute of Life and Death Studies, Hallym University, Chuncheon, Gangwon-do, Republic of Korea
2. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, South Korea
3. Aged Psychiatry Service, Caulfield Hospital, Alfred Health, VIC, Australia
4. Institute of Health and Environment, Seoul National University & Department of Health Sciences, Graduate School of Public Health, Seoul National University, Seoul, South Korea
5. Center for Social and Environmental System Research, National Institute for Environmental Studies, Tsukuba, Japan
6. Department of Psychiatry, Samsung Medical Center, Sungkyunkwan University School of Medicine, Gangnam-gu, Seoul, South Korea
7. Department of Psychiatry, Emeritus, Duke University Medical Center, Durham, NC, USA