By Dan Levine SAN FRANCISCO (Reuters) - A group of parents sued several football organizations including the sport's international governing body FIFA, saying they have failed to do more about concussions among children. The lawsuit, filed on Wednesday in a California federal court, says FIFA and other groups such as the American Youth Soccer Organization have not done enough to reduce preventable injuries from repetitive ball heading. The risks of head injuries in sports has been a recurring concern in the United States. Last month the National Collegiate Athletic Association agreed to settle a head injury lawsuit by creating a $70 million fund for concussion testing. Click here to read full news..