المؤلفون: Cronin, C. C., Higgins, T. M., Murphy, M. B., Ferriss, J. B.

المصدر: Postgraduate Medical Journal; Apr1997, Vol. 73 Issue 858, p239-240, 2p, 2 Graphs

المؤلفون: Keohane, C., Ferriss, J. B., Marks, C. J.

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