My son goes to Shriners in Philly, BUT I do know a few families who see Dr. Sturm and they are very pleased. He is chief of staff of Chicago Shriners Hospital so I wouldn't hesitate to recommend him just on that fact alone. I know he's worked closely with Dr. Betz on a few cases too. If you want, I can try to dig up the e-mail addresses for his patients.
Best of luck!