RT Journal Article SR Electronic T1 Is the call to reduce heading exposure in professional football to prevent dementia evidence-based? JF BMJ Open Sport & Exercise Medicine JO BMJ OPEN SP EX MED FD BMJ Publishing Group Ltd SP e001076 DO 10.1136/bmjsem-2021-001076 VO 7 IS 2 A1 Vincent Gouttebarge YR 2021 UL http://bmjopensem.bmj.com/content/7/2/e001076.abstract AB