Abstract
References
1.
MacKenzie
James
Sir
, “Angina Pectoris,”
1923 , p. 170 .
2.
Hirschfelder
A. D.
, “Diseases of the Heart and Aorta,”
1918 , 3rd ed. , p. 656 .
3.
Eschenbach
E.
, Zentralbl. f. Herz u. Gefässkr. , 1923 , xv , pp. 1 –13 .