1. Department of Agricultural, Forest and Food Sciences, University of Torino, Grugliasco, Italy
2. Département des Ressources Naturelles et du Corps Forestier, Assessorat de l’Environnement, des Ressources Naturelles et du Corps Forestier, Saint-Christophe, Italy
3. Department of Agricultural, Food and Environmental Sciences, University of Perugia, Perugia, Italy