The American Association of Medical Colleges website has 2 data tables on "Distribution of Chairs by Department, Gender, and Race/Hispanic Origin 2014."
Both tables can be accessed from the AAMC's The State of Women in Academic Medicine: The Pipeline and Pathways to Leadership, 2013-2014 page, which offers other statistical data as well. You can access the page here: https://www.aamc.org/members/gwims/statistics/
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