1. Wolfson Unit of Clinical Pharmacology, University of Newcastle upon Tyne, Newcastle NE2 4HH
2. Sunderland District General Hospital, Kayll Rd, Sunderland SR4 7TP
3. Middleborough General Hospital, Ayresome Green Lane, Middlesborough TS5 5AZ
4. Newcastle General Hospital, Westgate Road, Newcastle NE4 6BE
5. Queen Elizabeth Hospital, Sheriff Hill, Gateshead NE9 6SX
6. Dryburn Hospital, North Road, Durham DH1 5TW
7. Royal Victoria Infirmary, Queen Victoria Road, Newcastle NE1 4LP