Differences in sleep clinics? Doctors? St. Louis area

[Guardian]

Hi
I'm new to all this. My sister has apnea. She is disabled and I am her guardian. I would really like to hear from anyone who has experiences with one or more clinics and doctors in the St. Louis area. I'm not totally satisfied with my current one and wonder if it would do any good to get another opinion elsewhere. If they're all about the same tell me.
Feel free to PM me if you wish.Thanks for the help