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Source:
British Medical Journal (Clinical Research Edition), 1988 Jan . 296(6618), 310-311.
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Source:
British Medical Journal (Clinical Research Edition), 1985 May 01. 290(6479), 1417-1420.
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Source:
British Medical Journal (Clinical Research Edition), 1985 May . 290(6481), 1587-1587.
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Source:
British Medical Journal (Clinical Research Edition), 1985 Sep 01. 291(6496), 613-614.
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