The combination photo shows logos of CVS, Walmart and Walgreens

FILE PHOTO: The combination photo shows a logo of CVS in Manhattan, New York, U.S., August 1, 2016, re-usable Walmart bags in a newly opened Walmart Neighborhood Market in Chicago September 21, 2011 and a Walgreens sign in the Chicago suburb of Niles, Illinois, February 10, 2015. REUTERS/Andrew Kelly/Jim Young