title: Reply to Letter to the Editor.
authors.affiliation: , Los Angeles, CA, USA.
authors.forename: Fernando
authors.initials: F
authors.lastname: Beltramo
authors.affiliation: , Los Angeles, CA, USA.
authors.forename: Jandavid
authors.initials: J
authors.lastname: Menteer
authors.affiliation: , Los Angeles, CA, USA.
authors.forename: Asma
authors.initials: A
authors.lastname: Razavi
authors.affiliation: , Los Angeles, CA, USA.
authors.forename: Robinder G
authors.initials: RG
authors.lastname: Khemani
authors.affiliation: , Los Angeles, CA, USA.
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Szmuszkovicz
authors.affiliation: , Los Angeles, CA, USA.
authors.forename: Christopher J L
authors.initials: CJ
authors.lastname: Newth
authors.affiliation: , Los Angeles, CA, USA. paross@chla.usc.edu.
authors.forename: Patrick A
authors.initials: PA
authors.lastname: Ross