1. School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
2. Novartis Institutes for Biomedical Research; 250 Massachusetts Ave. Cambridge Massachusetts 02139 USA
3. Novartis Institutes for Biomedical Research, Novartis Campus; 4002 Basel Switzerland
4. School of Physics; University of Bristol, HH Wills Physics Laboratory; Bristol BS8 1TL UK
5. Instituto de Parasitología y Biomedicina; Avenida del Conocimiento, s/n 18016 Armilla, Granada Spain