Childhood physical activity and pubertal timing: findings from the LEGACY girls study

Rebecca D. Kehm, Julia A. Knight, Lauren C. Houghton, Jasmine A. McDonald, Lisa A. Schwartz, Mandy Goldberg, Wendy K. Chung, Caren J. Frost, Ying Wei, Angela R. Bradbury, Theresa H.M. Keegan, Mary B. Daly, Saundra S. Buys, Irene L. Andrulis, Esther M. John, Mary Beth Terry