1. Women’s Exercise and Bone Health Laboratory (M.J.D.S., J.V.H.), Faculty of Physical Education and Health, University of Toronto, Toronto, Ontario, Canada M5S 2W6;
2. Department of Kinesiology (J.V.H.), University of Connecticut, Storrs, Connecticut 06269;
3. Penn State University (L.M.D.), Milton S. Hershey Medical Center, Hershey, Pennsylvania 17033;
4. Institute of Toxicology and Environmental Health (B.L.L.), University of California, Davis, California 95616