1 Symptom Control and Palliative Care Department, The Royal Marsden Hospital, London, United Kingdom; Haematology Department, The Royal Marsden Hospital, Sutton, United Kingdom. Electronic address: rwilliams@doctors.org.uk.
2 Symptom Control and Palliative Care Department, The Royal Marsden Hospital, London, United Kingdom; Haematology Department, The Royal Marsden Hospital, Sutton, United Kingdom.