Authors: Gerard F Anderson; Dennis G Shea; Peter S Hussey; Salomeh Keyhani; Laurie Zephyrin Journal: Health Aff (Millwood) Date: 2004 Jul-Dec Impact factor: 6.301
Authors: Stephen Heffler; Sheila Smith; Sean Keehan; Christine Borger; M Kent Clemens; Christopher Truffer Journal: Health Aff (Millwood) Date: 2005 Jan-Jun Impact factor: 6.301