AP MEDICAL WRITER KISSIMMEE, Fla. -- Women who have higher natural estrogen levels also may have a higher risk of stroke - a novel finding that suggests a possible new way to prevent this deadly disease, doctors reported Friday. More study is needed to confirm these results, but they fit with much of what is already known about hormones, said several experts who were not connected with the new work. "This is really interesting," said Dr. JoAnn Manson, a women's health researcher and chief of preventive medicine at Harvard-affiliated Brigham and Women's Hospital in Boston. "These findings would be consistent...