Friday's health and safety news from the world of football:
- ESPN reported that Michael Sam, who is the only openly gay player to be drafted in the NFL, said during a Q&A in Dallas that there are many gay players in the league who have not come out.
- NFL.com reported that offensive lineman Jonathan Martin, who was the focus of locker room harassment and a subsequent league investigation while with the Miami Dolphins in 2013, was released Thursday by the San Francisco 49ers.
- WZTV-TV in Nashville reported that former NFL running back Eddie George dreams of being part of the Tennessee Titans ownership group.
- The Simi Valley (California) Acorn reported on the NCAA concussion study that will include Cal Lutheran University.
- KSHB-TV in Kansas City reported on the concussion conference at Kansas University's Overland Park campus that included NFL Evolution columnist Dr. Joseph Waeckerle.
- KCUR-FM in Kansas City profiled Waeckerle entering the conference.
-- Bill Bradley, contributing editor
