1. St John's Institute of Dermatology; Guy's and St Thomas' Hospital; Westminster Bridge Road London SE1 7EH U.K.
2. University Hospital Lewisham; Lewisham High Street London SE13 6LH U.K.
3. Gloucestershire Royal Hospital; Great Western Road Gloucester GL1 3NN U.K.
4. Cheltenham General Hospital; Sandford Road Cheltenham GL53 7AN U.K.