- Ciba Foundation (1959) defines asthma as a:
- Condition of subjects with widespread narrowing of the bronchial airways, which changes its severity over short periods of time either spontaneously or under treatment. [6]
- World Health Organization (WHO) (1975) defines asthma as a:
- Chronic condition characterized by recurrent bronchospasms resulting from a tendency to develop reversible narrowing of the airway lumina in response to stimuli of a level or intensity not inducing such narrowing in most individuals.
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