DOI: 10.1055/s-00000028

International Journal of Sports Medicine

References

Frisch RE, Gotz-Welbergen AV, McArthur JW, Albright T, Witschi J, Bullen B, Birnholtz J, Reed R, Hermann H.
Delayed menarche and amenorrhea of college athletes in relation to age of onset of training. 
J Am Med Ass 1981; 246: 1559-1563  

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