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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Mayo Clin Proc. 2016 Dec 12;92(1):66–71. doi: 10.1016/j.mayocp.2016.09.004

Figure 2.

Figure 2

John Marshall High School players, circa 1968–69, wearing a more modern helmet. (John Marshall High School Yearbook, 1969; Courtesy of Rochester Public Schools and The History Center of Olmsted County)