title: 15-0600-Dr. Fox's response to letter to the editor.
authors.affiliation: The Children's Hospital of Philadelphia, The Perelman School of Medicine at The University of Pennsylvania, CTRB 4016, 3501 Civic Center Blvd, Philadelphia, PA, 19104, USA. foxe@email.chop.edu.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Fox
authors.affiliation: The Children's Hospital of Philadelphia, The Perelman School of Medicine at The University of Pennsylvania, CTRB 4016, 3501 Civic Center Blvd, Philadelphia, PA, 19104, USA.
authors.forename: Frank M
authors.initials: FM
authors.lastname: Balis