[1] Amer Soc Clin Oncol, Alexandria, VA USA
[2] MedStar Washington Hosp Ctr, Washington, DC USA
[3] Stanford Univ, Stanford, CA 94305 USA
[4] Palo Alto Med Fdn, Mountain View, CA USA
[5] Mem Sloan Kettering Canc Ctr, Breast Canc Med Serv, New York, NY 10021 USA