1. Retired, Full Professor, Univ. of Palermo, Via San Nicolò all’Albergheria 4, 90134 Palermo, Italy.
2. Associate Professor, Dept. of Agricultural and Forest Sciences, Univ. of Palermo, Viale delle Scienze 13, Edificio 4, Ingresso E, 90128 Palermo, Italy.
3. Full Professor, Dept. of Agricultural and Forest Sciences, Univ. of Palermo, Viale delle Scienze 13, Edificio 4, Ingresso E, 90128 Palermo, Italy.
4. Researcher-Technologist, INAIL—Research, Certification and Check Sector—UOT Como, Via Petrarca, 4, 22100 Como, Italy (corresponding author).