Comparative Effectiveness Research

From the Department of Radiology (J.A.H., P.W.S., J.M.R., J.D.R.), Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts; Department of Radiology (P.C.S.), Weill Cornell Medical College, NewYork-Presbyterian Hospital, New York, New York; Pain Management Center of Paducah (L.M.), Paducah, Kentucky; and Department of Anesthesiology and Perioperative Medicine (L.M.), University of Louisville, Louisville, Kentucky.

From the Department of Radiology (J.A.H., P.W.S., J.M.R., J.D.R.), Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts; Department of Radiology (P.C.S.), Weill Cornell Medical College, NewYork-Presbyterian Hospital, New York, New York; Pain Management Center of Paducah (L.M.), Paducah, Kentucky; and Department of Anesthesiology and Perioperative Medicine (L.M.), University of Louisville, Louisville, Kentucky.

From the Department of Radiology (J.A.H., P.W.S., J.M.R., J.D.R.), Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts; Department of Radiology (P.C.S.), Weill Cornell Medical College, NewYork-Presbyterian Hospital, New York, New York; Pain Management Center of Paducah (L.M.), Paducah, Kentucky; and Department of Anesthesiology and Perioperative Medicine (L.M.), University of Louisville, Louisville, Kentucky.

From the Department of Radiology (J.A.H., P.W.S., J.M.R., J.D.R.), Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts; Department of Radiology (P.C.S.), Weill Cornell Medical College, NewYork-Presbyterian Hospital, New York, New York; Pain Management Center of Paducah (L.M.), Paducah, Kentucky; and Department of Anesthesiology and Perioperative Medicine (L.M.), University of Louisville, Louisville, Kentucky.

From the Department of Radiology (J.A.H., P.W.S., J.M.R., J.D.R.), Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts; Department of Radiology (P.C.S.), Weill Cornell Medical College, NewYork-Presbyterian Hospital, New York, New York; Pain Management Center of Paducah (L.M.), Paducah, Kentucky; and Department of Anesthesiology and Perioperative Medicine (L.M.), University of Louisville, Louisville, Kentucky.

From the Department of Radiology (J.A.H., P.W.S., J.M.R., J.D.R.), Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts; Department of Radiology (P.C.S.), Weill Cornell Medical College, NewYork-Presbyterian Hospital, New York, New York; Pain Management Center of Paducah (L.M.), Paducah, Kentucky; and Department of Anesthesiology and Perioperative Medicine (L.M.), University of Louisville, Louisville, Kentucky.