[Laura Maxwell], a nurse practitioner, administers a tetanus shot to Colleen Casey at The Little Clinic set up in a Kroger store in Louisville. Maxwell views retail clinics as a complement to a physician's care, but the AMA says it has concerns. Laura Maxwell talks with Colleen Casey and Casey's father, Robert, about the treatment she administered. Deerfield- based Walgreens plans to open more than 20 such clinics inside its stores in St. Louis and the Kansas City area. Photos for the Tribune by Brian Bohannan