1. Agroscope, Plant Protection Chemistry, CH-8820 Wädenswil, Switzerland
2. Agroscope, Food Analytics, CH-3003 Bern, Switzerland
3. IRNAS, Institute of Natural Resources and Agrobiology of Seville, E-41012 Seville, Spain
4. Swiss Federal Institute of Technology, Department of Environmental Systems Science, CH-8092 Zürich, Switzerland