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Alan Leviton, MD; Ted Kilty, PhD

Arch Neurol. 1979;36(2):115-116.

Abstract
• The birth of left-handed girls in a school population displayed a seasonal trend, with a peak in November. No seasonal trend was seen in the birth of left-handed boys. The seasonal pattern of birth of left-handed girls is compatible with the hypothesis that nongenetic factors contribute to the occurrence of left-handedness.

Author Affiliations
From the Department of Neurology, Children's Hospital Medical Center and Harvard Medical School, Boston (Dr Leviton), and the Department of Teacher Education, Western Michigan University, Kalamazoo (Dr Kilty).

Footnotes
Accepted for publication Oct 10, 1977.

Read in part before the ninth annual meeting of the Society for Epidemiologic Research, Toronto, June 17, 1976.

Reprint requests to Children's Hospital Medical Center, 300 Longwood Ave, Boston, MA 02115 (Dr Leviton).

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