Please note that the ASTRAL trial and its associated sub-studies closed to recruitment in October 2007.
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Obtain patient consent.
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Prepare for telephone questions using the randomisation notepad.
Note: The person randomising will need to answer all questions on the randomisation notepad.
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Ring the randomisation service on 0800 953 0274 (toll-free).
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When all the relevant questions on the randomisation notepad have been answered, a treatment allocation and patient reference number will be given.