US's Christian Coleman celebrates after winning the men's 100m race at the 2018 edition of the AG Insurance Memorial Van Damme IAAF Diamond League athletics meeting, Friday 31 August 2018 in Brussels. BELGA PHOTO DIRK WAEM

Belgian Eline Berings and Dutch Nadine Visser pictured in action during the women's 100m hurdles race at the 2018 edition of the AG Insurance Memorial Van Damme IAAF Diamond League athletics meeting, Friday 31 August 2018 in Brussels. BELGA PHOTO JASPER JACOBS

Illustration picture shows the 'Play True Day' anti-doping action by Sport Vlaanderen at the 2018 edition of the AG Insurance Memorial Van Damme IAAF Diamond League athletics meeting, Friday 31 August 2018 in Brussels. BELGA PHOTO JASPER JACOBS