Polycythaemia vera was diagnosed when the haemoglobin was greater than 17 g./100 ml. or the red cell count greater than 6,000,000/cu. mm., together with one other feature-namely, a leucocyte count greater than 12,000/cu. mm., a platelet count greater than 300,000/cu. mm., or splenomegaly. Acute leukaemia was diagnosed when both blood and marrow were on 29 May
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Watkins et al. (1967) studied this question.
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