In chronic bronchitis and asthma Choledyl provides effective theophylline blood levels for more than 6 hours : Arctic or Richardson's skua.

Date:
[between 1970 and 1980?]

Licence: In copyright

Credit: In chronic bronchitis and asthma Choledyl provides effective theophylline blood levels for more than 6 hours : Arctic or Richardson's skua. Source: Wellcome Collection.

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