RT Journal Article SR Electronic T1 Early Factor VIII Prophylaxis Prevents Joint Damage in Hemophilia JF AAP Grand Rounds JO AAP Grand Rounds FD American Academy of Pediatrics SP 44 OP 44 DO 10.1542/gr.44-4-44 VO 44 IS 4 YR 2020 UL http://aapgrandrounds.aappublications.org/content/44/4/44.abstract AB