1. Departamento Sistemas y Recursos Forestales, CIFOR-INIA, Ctra. Coruña, km 7.5, Madrid 28040, Spain.
2. Department. of Forest Resources Management, University of British Columbia, 2045-2424 Main Mall, Vancouver, BC V6T 1Z4, Canada.
3. WSL Institute for Snow and Avalanche Research SLF, Flüelastrasse 11, CH-7260 Davos, Switzerland.