Auditioning for popular dance competition show So You Think You Can Dance requires a certain level of bravery, talent and commitment. For Lauren Luteran, though, just being able to dance requires much more strength and stamina than the average performer exhibits. Luteran, 19, was diagnosed with cystic fibrosis - a genetic disorder that causes lung infections - just five months after she was born. Doctors told her parents that putting her in some kind of sport or activity would help the mucus in her body break down. Her family wanted to keep her in a contained environment, so they enrolled . . .