1. Eurofins Food & Agro Testing Sweden AB; PO box 887 SE-531 18 Lidköping Sweden
2. Department of Plant Biology; Uppsala Biocenter; Swedish University of Agricultural Sciences; PO box 7080 SE-750 07 Uppsala Sweden
3. Precision Agriculture and Pedometrics; Department of Soil and Environment; Swedish University of Agricultural Sciences; PO box 234 SE-523 23 Skara Sweden
4. Rural Economy and Agricultural Society; HS Konsult AB; PO box 271 SE-701 45 Örebro Sweden