NasalSprayformCJPH37110103
NasalSprayformCJPH37110103.jpg
Consent form, Nasal Spray trial, Toronto, Canada, 1937 (F.F. Tisdall (et al.), "Zinc Sulphate Nasal Spray in the Prophylaxis of Poliomyelitis," Canadian Public Health Jounal 28 (November 1937), p. 543)
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