The Doctor refers to himself as human in episode 2.

It seems that sometimes even doctors refer to a higher authority.

Your doctor can also refer you to a sleep specialist, if necessary.

In other cases, your doctor may refer you to an appropriate specialist.

If surgery is needed, your doctor may refer you to a general surgeon.

Your doctor may refer you to a mental health care provider.

Doctor Strong refers to me in public as a promising young scholar.

The doctor referred again to the ledger page before him.

Your doctor may refer you to a specialist for treatment of specific complications.

For example, your doctor may refer you to an endocrinologist.