1. Department of Forestry, Faculty of Natural Resources University of Guilan Somehsara Iran
2. Forest Ecology Research Group, College of Life Sciences Hebei University Baoding Hebei PR China
3. Institute of Forestry and Conservation, John Daniels Faculty of Architecture, Landscape and Design University of Toronto Toronto Ontario Canada
4. Chair of Forestry Economics and Forest Planning University of Freiburg Freiburg Germany