"I am so nervous, that I think that I am going to puke." Seven-teen year old Heather Burke said, as she and her one year older sister, Hallie, waited back stage for their perform-ance. "After all, no one has seen me since I was pronoun-ced cancer free, and dischar-ged from the hos-pita on Tues-day even-ing.""Sweet sweet, there is nothing to be nervous about." Hallie smiled. "Every-one is going to be so happy and excited to see you out of the hospital...