2 Department of Radiology, Tyrone Hospital, Tyrone, Pennsylvania.
3 Department of Radiology, Summit Health, Chambersburg, Pennsylvania.
4 Department of Radiology, Ochsner Clinic Foundation, New Orleans, Louisiana.
5 Department of Radiology and Imaging Sciences, Emory University School of Medicine, Johns Creek, Georgia. Electronic address: ebfriedberg@hotmail.com.