AnginaTrue vertigo Migraine Intermittent Transient loss of Headache claudication consciousness Dyspnoea on exertion Transient loss of vision Depressive illness Paroxysmal nocturnal Transient paresis Nocturia dyspnoea (less than 24 hours) Ankle oedema Cerebrovascular Dysuria accident (more than Haematuria 24 hours)
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David F. Horrobin (1974) studied this question.