[1] Stanford Univ, Dept Radiat Oncol, Sch Med, Stanford, CA 94305 USA
[2] Calif Pacific Palo Alto Med Fdn, Div Gynecol Oncol, San Francisco, CA USA
[3] Touro Coll Osteopath Med, New York, NY USA
[4] Palo Alto Med Fdn, Res Inst, Palo Alto, CA 94301 USA