[1] NCI, Rockville, MD 20850 USA
[2] Patient Ctr Outcomes Res Inst, Washington, DC USA
[3] Amer Canc Soc, Atlanta, GA 30329 USA
[4] Harvard Univ, Sch Med, Boston, MA USA
[5] Harvard Vanguard Med Associates, Boston, MA USA
[6] Univ Calif Los Angeles, Sch Med, Los Angeles, CA USA
[7] Univ Calif Los Angeles, Sch Publ Hlth, Los Angeles, CA 90024 USA