Calvin Johnson says he learned to play through concussions during his career with the Lions - The Washington Post
Calvin Johnson: Detroit Lions 'wanted me to change my story' about concussions
NFL's Progress On Concussions Blurred By Inconsistencies
Detroit Lions notes: Calvin Johnson could be game-time decision – Macomb Daily
Calvin Johnson opens up about concussions, painkillers in NFL
Calvin Johnson's beef with the Lions, and his $1.6M demand, explained
Calvin Johnson Says Concussions Are 'Part of Football,' Adds 'You Gotta Keep on Playing'
Calvin Johnson dealing with nerve damage – The Morning Sun
NFL Concussions: The 2012-13 Season In Review
Calvin Johnson never listed as suffering a concussion but says he had his 'fair share'
BU Finds CTE in Nearly 92 Percent of Ex-NFL Players Studied, The Brink
Calvin Johnson Says He Smoked Weed After Every Game To Deal With Playing For The Detroit Lions