Joseph Goldberger, W. F. Tanner, A Study of the Treatment and Prevention of Pellagra. Experiments Showing the Value of Fresh Meat and of Milk, the Therapeutic Failure of Gelatin, and the Preventive Failure of Butter and of Cod-Liver Oil, Public Health Reports (1896-1970), Vol. 39, No. 3 (Jan. 18, 1924), pp. 87-107
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Goldberger et al. (1924) studied this question.