my DAUGHTER HAS CF.SHE IS 15,AND SHE USES THE VEST I BELIEVE USING THE VEST HAS MADE A GREAT DIFFERENCE AND AND I BELIEVE DOING YOUR THUMPING DIRECTLY AFTER TREATMENT WORKS BETTER.GOOD LUCK ON THE VEST .IS THERE ANYBODY WITH ADVICE ON HOW 2 EXPLAIN CERTAIN THINGS ABOUT CF.TO A 15 YEAR OLD?