1. Horseracing Forensic Laboratory Ltd., P.O. Box 15, Snailwell road, Newmarket, Suffolk, CB8 7DT
2. Microchemical Facility, The Babraham Institute, Babraham Hall, Cambridge
3. Department of Clinical Biochemistry, St. Bart's and The Royal London School of Medicine & Dentistry, Turner Street, London, E1 2AD