title: Reply.
authors.affiliation: Boston University School of Medicine, Boston, MA.
authors.forename: Tuhina
authors.initials: T
authors.lastname: Neogi
authors.affiliation: Boston University School of Medicine, Boston, MA.
authors.forename: Ali
authors.initials: A
authors.lastname: Guermazi
authors.affiliation: Boston University School of Medicine, Boston, MA.
authors.forename: Frank
authors.initials: F
authors.lastname: Roemer
authors.affiliation: University of California, San Francisco, CA.
authors.forename: Michael C
authors.initials: MC
authors.lastname: Nevitt
authors.affiliation: University of Iowa Carver College of Medicine, Iowa City, IA.
authors.forename: Laura
authors.initials: L
authors.lastname: Frey Law