1 Centre for Urban Greenery and Ecology Research, National Parks Board, Singapore, 259569, Singapore. angelia_sia@nparks.gov.sg.
2 Department of Psychological Medicine, National University of Singapore, Singapore, 119228, Singapore. angelia_sia@nparks.gov.sg.
3 Alice Lee Centre for Nursing Studies, Yong Loo Lin School of Medicine, National University of Singapore, Level 2, Clinical Research Centre, Block MD11, 10 Medical Drive, Singapore, 1175974, Singapore.
4 Brenner Centre for Molecular Medicine, Singapore Institute for Clinical Sciences, 30 Medical Drive, Singapore, 117609, Singapore.
5 Department of Psychological Medicine, National University of Singapore, Singapore, 119228, Singapore.
6 Centre for Urban Greenery and Ecology Research, National Parks Board, Singapore, 259569, Singapore.