RT Journal Article SR Electronic T1 William E. Ladd Medal JF AAP News JO AAP News FD American Academy of Pediatrics SP 33 OP 33 DO 10.1542/aapnews.20123310-33e VO 33 IS 10 YR 2012 UL http://www.aappublications.org/content/33/10/33.6.abstract AB