[1] Harvard Med Sch, Boston, MA 02115 USA
[2] Beth Israel Deaconess Med Ctr, Dept Med, Atrium Suite,330 Brookline Ave, Boston, MA 02215 USA
[3] Univ Texas San Antonio, Joe R & Teresa Lozano Long Sch Med, San Antonio, TX USA
[4] Penn State Coll Med, Milton S Hershey Med Ctr, Hershey, PA USA
[5] Amer Coll Physicians, Res & CME Compliance, Philadelphia, PA USA
[6] Univ Arizona, Coll Med Phoenix, Phoenix, AZ USA