Key Takeaways Walgreens Boots Alliance's third-quarter profit fell short of estimates, and the company cut its outlook because of what it called a "difficult operating environment." The big pharmacy chain and healthcare provider also planned changes to its U.S. Healthcare segment and said it would close "certain underperforming stores." Shares of Walgreens fell to levels not seen since 1997. Walgreens Boots Alliance (WBA) shares crashed to their lowest level since 1997 on Thursday as the big pharmacy chain ...