1. Donnan and Robert Robinson Laboratories, Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, U.K.
2. Romark Laboratories, L.C., Tampa, Florida 33609, United States
3. Romark Belgium BVBA, Roosveld 6, 3400 Landen, Belgium
4. Department of Biology, University of Rome Tor Vergata, 00133 Rome, Italy
5. Institute of Translational Pharmacology, CNR, Area della Ricerca di Roma 2, Via Fosso del Cavaliere, 00133 Roma, Italy
6. Ardena Gent NV, Kleimor 4, 9030 Mariakerke, Belgium
7. Bio-Techne, Avonmouth, Bristol BS11 9QD, U.K.