RT Journal Article SR Electronic T1 Patellofemoral pain during adolescence: much more prevalent than appreciated JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 831 OP 832 DO 10.1136/bjsports-2016-096328 VO 50 IS 14 A1 M S Rathleff YR 2016 UL http://bjsm.bmj.com/content/50/14/831.abstract AB