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References
1.Boston Medical and Surgical Journal , May 20, 1909 .
2.American Journal of the Medical Sciences , July, 1909 .
3.Fraenkel's Archives , Bd. XXI , 1909 .
4.Fraenkel's Archives , Bd. XXIV , 1909 .
5.Fraenkel's Archives , Bd. XXIII , 1909 .