Try to find a Neurologist in a Children Hospital in USA.
If the family is not billionare, may forget it.
Google "best children hospital", you will find the top children's hospital.
The tops are:
1. Boston Children's hospital
2. Children's Hospital in Phildelphia
3. Cincinnati Childdren's hospital
4. Johns Hopkins Hospotial in Baltimore, MD
5. Baylor in TX.