1. Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences Sofia Bulgaria
2. Vegetation Analysis and Plant Diversity, Albrecht von Haller Institute of Plant Sciences University of Göttingen Göttingen Germany
3. Swiss Federal Research Institute WSL Birmensdorf Switzerland
4. Amsterdam the Netherlands
5. Department of Botany, School of Biology Aristotle University of Thessaloniki Thessaloniki Greece
6. Department of Forestry and Natural Environment Management, School of Plant Sciences Agricultural University of Athens Athens Greece
7. Department of Botany and Zoology Masaryk University Brno Czech Republic
8. Department of Forestry, Wood Sciences and Design University of Thessaly Thessaly Greece
9. Vegetation Ecology Research Group, Institute of Natural Resource Sciences (IUNR), Zurich University of Applied Sciences (ZHAW) Wädenswil Switzerland
10. Plant Ecology, Bayreuth Center of Ecology and Environmental Research (BayCEER) University of Bayreuth Bayreuth Germany