title: Authors' reply.
authors.affiliation: Department of Rehabilitation Science, College of Health and Human Services George Mason University, 4400 University Drive 2G7 Fairfax, VA, 22030, U.S.A.. jcolli22@gmu.edu.
authors.forename: John
authors.initials: J
authors.lastname: Collins
authors.forename: Minh
authors.initials: M
authors.lastname: Huynh
mesh_terms: D006801:Humans; D015233:Models, Statistical