title: Measuring Postconcussive Activity Levels of Patients-Reply.
authors.affiliation: Department of Biostatistics and Epidemiology, University of Pennsylvania Perelman School of Medicine, Philadelphia.
authors.forename: Douglas J
authors.initials: DJ
authors.lastname: Wiebe
authors.affiliation: Department of Surgery, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
authors.forename: Michael L
authors.initials: ML
authors.lastname: Nance
authors.affiliation: Sports Medicine and Performance Center, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
authors.forename: Christina L
authors.initials: CL
authors.lastname: Master
mesh_terms: D001924:Brain Concussion; D006801:Humans; D038223:Post-Concussion Syndrome