Age at Menarche and Racial Comparisons in US Girls.
Chumlea, William Cameron; Schubert, Christine M.; Roche, Alex F.; Sun, Shumei S.; Kulin, Howard E.; Lee, Peter A.; Himes, John H.; Pediatrics, 2003, vol. 111, issue 1, p 110, ISSN 00314005. ISBN 00314005.
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