Neurologist Neurologist Antonio Culebras, MD, explains why sleep apnea is so dangerous Antonio Culebras, MD, explains why sleep apnea is so dangerous. Gastroenterologist. Gastroenterologist Sekou Rawlins, MD, discusses inflammatory bowel diseases Sekou Rawlins, MD, discusses inflammatory bowel diseases. Nurse practitioner. Nurse practitioner Stephanie Loveless talks about secondary strokes Stephanie Loveless talks about secondary strokes and their prevention. and their prevention.