Editor's Comments

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Johnson, C.F. : Abnormal thumbs and physical diagnosis. Clin. Pediatr. 9: 131, 1970.

Opitz, J.M. , et al.: Birth Defects Original Article Series, Vol. 144, No. 2, February, 1969.

Johnson, C.F. : The thumb in trisomy 18. JAMA 215: 489, 1971.

Barash, B.A. , Freedman, L. and Opitz, J.M. : Anatomic studies in the 18 trisomy syndrome . Birth Defects Original Article Series, Vol. 3 No. 4, October, 1970 .