Hi
You could also write about the added psychological challenges of being a diabetic, when leaving home and going to uni and managing diabetes without the usual support systems in a different environment whilst still trying to accommodate the demands that uni life presents eg parties, exam stress, future careers. Also the stigma associated with diabetes at this psychologically vulnerable time in a teenager's life of the overt manifestations of diabetes like injecting and hypos.
The data could be collected via flyers with an email address distributed through GP surgeries that are in the area of uni, at the uni disability office and pinning up flyers around campus