[1] Univ Calif San Francisco, San Francisco, CA 94143 USA
[2] Univ Hong Kong, Queen Mary Hosp, Hong Kong, Peoples R China
[3] Asan Med Ctr, Seoul, South Korea
[4] Chinese Univ Hong Kong, Hong Kong, Peoples R China
[5] Vet Gen Hosp, Taipei, Taiwan
[6] Novartis Pharmaceut, E Hanover, NJ USA