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Wanscher O (1877). Om Diphteritis og Croup - særligt med hensyn til Tracheostomien ved samme. [On diphtheria and croup - especially regarding tracheostomy in this condition]. Disputats [Thesis]. Jacob Lund: Kjøbenhavn, p 67-68.

Methodological context

Principles of testing
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Control of allocation bias
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