RT Journal Article SR Electronic T1 Timing of Tdap Immunization in Pregnancy to Protect Young Infants JF AAP Grand Rounds JO AAP Grand Rounds FD American Academy of Pediatrics SP 65 OP 65 DO 10.1542/gr.29-6-65 VO 29 IS 6 YR 2013 UL http://aapgrandrounds.aappublications.org/content/29/6/65.abstract AB