Walgreens confirmed Tuesday a new round of layoffs, the latest in a string of job cuts over the past year as the retail pharmacy giant aims to slash costs. Walgreens spokesman Fraser Engerman said the company is not disclosing the number of people it’s laying off. Most of the positions are Chicago-based, he said in a statement. “To ensure we are operating as efficiently as possible, and to deliver on our plan to reduce costs, we have identified areas in our Corporate Support Center where we can reduce complexity and consolidate work, resulting in the elimination of some positions,” he said in the statement.