1. Instituto de Agroquímica y Tecnología de Alimentos (IATA-CSIC); Avda. Agustín Escardino 7 46980 Paterna Valencia Spain
2. Mass Spectrometry Facility/Drug Control Centre; King's College London; Franklin-Wilkins Building 150 Stamford Street London SE1 9NH UK
3. Specialist Bioanalytical Services Ltd; Egham Surrey TW20 9LZ UK