Authors: Laura A Giordano; Marc N Elliott; Elizabeth Goldstein; William G Lehrman; Patrice A Spencer Journal: Med Care Res Rev Date: 2009-07-28 Impact factor: 3.929
Authors: P D Cleary; S Edgman-Levitan; M Roberts; T W Moloney; W McMullen; J D Walker; T L Delbanco Journal: Health Aff (Millwood) Date: 1991 Impact factor: 6.301