Socioeconomic status in relation to early menarche among black and white girls.
Braithwaite D, Moore DH, Lustig RH, Epel ES, Ong KK, Rehkopf DH, Wang MC, Miller SM, Hiatt RA
Cancer causes & control : CCC. Mar 2008
(DOI : 10.1007/s10552-008-9284-9)