[1] Massachusetts Gen Hosp, Dept Radiol, Decis Anal & Technol Assessment Grp, Boston, MA 02114 USA
[2] Harvard Univ, Sch Publ Hlth, Dept Hlth Policy & Management, Boston, MA 02115 USA
[3] Osped Gen, Dept Radiol, Busto Arsizio, Italy
[4] Osped Civile, Dept Radiol, Vimercate, Italy
[5] Beth Israel Deaconess Med Ctr, Dept Radiol, Boston, MA 02215 USA