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Among 123 Nigerians with migraine seen at one clinic 49 (40%) had complicated migraine, with ophthalmoplegia in 20 and amaurosis or field defects in 13. Haemoglobin AS was found in 60% of patients with complicated migraine, compared with 20% of those with simple migraine.
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Osuntokun et al. (1972) studied this question.
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