[1] Univ Calif Los Angeles, David Geffen Sch Med, Los Angeles, CA 90095 USA
[2] Prince Wales Hosp, Shatin, Hong Kong, Peoples R China
[3] Massachusetts Gen Hosp, Boston, MA 02114 USA
[4] Princess Margaret Canc Ctr, Toronto, ON, Canada
[5] Univ Toronto, Toronto, ON, Canada
[6] Natl Taiwan Univ Hosp, Dept Oncol, Taipei, Taiwan
[7] Merck & Co Inc, Kenilworth, NJ USA
[8] Kindai Univ, Fac Med, Osaka, Japan