- humboldt-universitat zu berlin7
- escholarship, university of california3
- aarhus univ, aarhus, denmark1
- aarhus univ, dk-8000 aarhus c, denmark.1
- agroparistech, paris, france.1
- bangor univ, bangor, gwynedd, wales1
- biomed central1
- blackwell publishing1
- chalmers univ technol, gothenburg, sweden1