Authors: Jerome Engel; Michael P McDermott; Samuel Wiebe; John T Langfitt; John M Stern; Sandra Dewar; Michael R Sperling; Irenita Gardiner; Giuseppe Erba; Itzhak Fried; Margaret Jacobs; Harry V Vinters; Scott Mintzer; Karl Kieburtz Journal: JAMA Date: 2012-03-07 Impact factor: 56.272