Leuven Lung Cancer Group.

Collaborative Ovarian Cancer Group.

Dutch ColoRectal Cancer Group.

Children's Cancer Group.

Children's Cancer Group Surgical Committee.

Childrens Cancer Group.

"We didn't have trouble finding children to enroll," said Dr. Archie Bleyer, the chairman of the Children's Cancer Group.

Danish Vesical Cancer Group.

The National Bladder Cancer Group.

The Children's Cancer Group 2891 trial accrued patients between 1989 and 1995, including children with MDS.