[1] Univ Malaya, Inst Postgrad Studies & Res, Kuala Lumpur 2211, Malaysia
[2] Univ Maryland, Ctr Vaccine Dev, Baltimore, MD 21201 USA
[3] WHO, Vaccine Res & Dev, CH-1211 Geneva, Switzerland
[4] Ctr Trop Dis, Wellcome Trust Clin Res Unit, Ho Chi Minh City, Vietnam
[5] Univ British Columbia, Biotechnol Lab, Vancouver, BC V6T 1Z3, Canada