Typically, he soon directed his energy and concern to one of the greatest medical challenges, the fight against cancer.

These are not insurmountable medical challenges, but they *are* real problems in real-life space experience.

He has also written seven highly praised children's picture books for and about children facing medical challenges.

Thanks to your security guard's excellent aim, he was quite a medical challenge.

It is becoming one of the biggest medical challenges of the 21st century.

And for all the research on treatment, the cancer remains a medical challenge.

It was designed to be accessible to all children visiting the zoo, including those with medical and physical challenges.

Serious traumatic head injuries remain to this day a medical challenge.

People who have finished cancer treatment often have psychological and physical medical challenges.

They'd be just medical challenges to the doctors and freaks to everyone else.