Scientists still need a "better understanding of the molecular processes that govern hair growth," Dr. Wolf said, including genes and hormones involved.

This may be due in part to basic differences in men and women, including genetics, hormones, body size, diet, and sociocultural issues.

Hormones, including hormones used for hormone replacement therapy or birth control, don't cause lupus.

Many factors can affect the rate of metabolism, including exercise, diet, temperature, and hormones.

Research has identified several biological factors which may be related to the development of sexual orientation, including genes, prenatal hormones, and brain structure.

The changes, including fluctuating hormones, increase the woman's susceptibility to oral infections such as periodontal disease.

Some categories were excluded from such assessments, including hormones, like estrogen, which are natural substances.

Dr. Sheftell said a variety of circumstances could touch off an attack, including hormones, diet and changes in the weather, sleep patterns or the seasons.

Certain chemicals, including hormones, can influence the composition of the ligaments.

To do this, one must use new treatments, including new medicines, natural hormones, electrical therapies and lifestyle modification.