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2. S. Shimoda and K. Kasai, in “The Thyroid Disease” (in Japanese), ed. by K. Yoshinaga, Kinbara Publishing Co., Tokyo, 1978, pp. 156–170.
3. G. W. Snedecor and W. G. Cochlan, in “Statistical Methods,” 6th Ed., Iowa State University Press, Ames, IA, U.S.A., 1967, pp. 135–171.