1. Gembloux Agro-Bio Tech, AgroBioChem Department; University of Liège; Crop Science Unit, 2 Passage des Déportés 5030 Gembloux Belgium
2. Valorisation of Agricultural Products Department, Food and Feed Quality Unit; Walloon Agricultural Research Centre; Henseval Building, 24 Chaussée de Namur 5030 Gembloux Belgium