1. Univ. Artois, EA 7394, ICV‐Institut Charles VIOLLETTE Lens F‐62300 France
2. INRA, USC 1281 Lille F‐59000 France
3. Ulco F‐62200 Boulogne‐sur‐Mer France
4. Univ. Lille Lille F‐59000 France
5. YNCREA Lille F‐59000 France
6. ADRIANOR F‐62217 Tilloy‐Les‐Mofflaines France