1. Burckhardt Institute, Tropical Silviculture and Forest Ecology, Faculty of Forest Sciences and Forest Ecology, University of Göttingen, Germany
2. School of Agriculture, Geography, Environment, Ocean and Natural Sciences, The University of the South Pacific, Suva, Fiji Islands
3. Institute of Forestry and Environmental Sciences, University of Chittagong, Chattogram, Bangladesh
4. Institute of Geobotany, Leibniz University, Hannover, Germany