RT Journal Article SR Electronic T1 Secular Trend for Earlier Onset of Peak Height Velocity in Boys JF AAP Grand Rounds JO AAP Grand Rounds FD American Academy of Pediatrics SP 69 OP 69 DO 10.1542/gr.42-6-69 VO 42 IS 6 YR 2019 UL http://aapgrandrounds.aappublications.org/content/42/6/69.abstract AB