RT Journal Article SR Electronic T1 Resumption of physical activity within 7 days of a concussion was associated with lower rates of persistent postconcussive symptoms (PPCS) JF Archives of disease in childhood - Education & practice edition JO Arch Dis Child Educ Pract Ed FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 110 OP 111 DO 10.1136/archdischild-2017-313141 VO 103 IS 2 A1 Anand Nitin Kanani A1 Stuart Hartshorn YR 2018 UL http://ep.bmj.com/content/103/2/110.abstract AB