1. University Hospitals Birmingham NHS Foundation Trust; Queen Elizabeth Hospital; Edgbaston Birmingham B15 2TH U.K.
2. Cancer Research U.K. Clinical Trials Unit; School of Cancer Sciences; The University of Birmingham; Edgbaston Birmingham B15 2TT U.K.
3. Nottingham Clinical Trials Unit; University of Nottingham; Nottingham U.K.
4. Royal Surrey County Hospital; Guildford U.K.