1. CIRAD, UMR ASTRE Montpellier France
2. ASTRE Univ Montpellier, CIRAD, INRAE Montpellier France
3. Mas d'arboux Roquedur France
4. Section of Epidemiology University of Zurich Zurich Switzerland
5. VetAgro Sup INRAE, EPIA, Marcy L’étoile Lyon France