[1] Natl Canc Ctr, Dept Med Oncol, Singapore, V5Z 4E6, Singapore
[2] Natl Taiwan Univ Hosp, Div Digest Disorders, Taipei, 60064, Taiwan
[3] Univ Toronto, Dept Med Oncol, Toronto, ON 60064, Canada
[4] British Columbia Canc Agcy, Dept Adv Therapeut, Vancouver 117548, BC, Canada
[5] Abbott Labs, Oncol, Abbott Pk, IL USA
[6] Abbott Labs, Global Stat & Data Management, Abbott Pk, IL USA
[7] Natl Univ Singapore Hosp, Dept Haematol Oncol, Singapore, Singapore