Pharmacy assistant Ruby Cardenas puts away filled prescriptions at a Walgreens store in Willowbrook, Illinois, U.S., on Friday, Dec. 21, 2007....
Pharmacist Grace Chiaro-Bolch, left and assistant Jean Galvin fill prescriptions at a Walgreens store in Willowbrook, Illinois, U.S., on Friday, Dec....
Walgreen Co. Assistant Store Manager Tammy Jenkins stocks sandwiches at one of the company's stores in Louisville, Kentucky, U.S., on Monday, Sept....
Walgreen Co. Cashier June White rings up a customer at one of the company's stores in Louisville, Kentucky, U.S., on Monday, Sept. 30, 2013. Walgreen...
Walgreen Co. Assistant Store Manager Tammy Jenkins updates price tags at one of the company's stores in Louisville, Kentucky, U.S., on Monday, Sept....
Walgreen Co. Assistant Store Manager Tammy Jenkins updates price tags at one of the company's stores in Louisville, Kentucky, U.S., on Monday, Sept....