Heading football and head impacts 'change blood patterns in brain', Soccer

Repeated heading and accidental head impacts in football potentially interfere with signalling pathways in the brain, according to a study of players in Norway

Blood samples from professional soccer players provides latest evidence that headers affect brain activity - Taylor & Francis Newsroom

What are World Cup players wearing around their necks?

Sports Injury Bulletin - Diagnose & Treat - Sports-related concussion: heading football fears

Blood samples reveal consequences of head impacts in football - Neuro Rehab Times

Soccer study finds women suffer more damage from headers than men

Do Headers In Soccer Lead to Brain Injuries?, by Dr. Rajpal Brar, Grandstand Central

What Happens When Soccer Bans Heading? - The Ringer

Football is heading for trouble over brain injuries caused by the ball, Soccer

Dangers of soccer headers a gray area

Overview of tiered video assessment for collecting head impact exposure