Even after comprehensive testing, about 30% of children with short stature — height below the third percentile on a growth chart — do not have a definitive diagnosis, leading to extended surveillance, testing and anxiety.

Understanding factors that contribute to the development of colorectal cancer could point to new targets for treating the disease at earlier stages, when survival rates are highest.

Severe obesity — a condition of being 100 pounds or more overweight — has doubled in the United States over the past two decades to 9.2%, with the greatest increases among women and Latino populations.