Response to: Comment on “Failure of the Pipeline Embolization Device in Posterior Communicating Artery Aneurysms Associated with a Fetal Posterior Cerebral Artery”

1Department of Neurosurgery, University of Iowa Hospital and Clinics, 200 Hawkins Drive, Iowa City, IA 52242, USA 2Department of Neurological Surgery, Thomas Jefferson University and Jefferson Hospital for Neuroscience, 3rd Floor, 901 Walnut Street, Philadelphia, PA 19107, USA 3Department of Neurosurgery, University of Virginia, Charlottesville, VA 22908, USA 4Department of Neurosurgery, Yale University, New Haven, CT 06519, USA