机构:
UCL Royal Free & Univ Coll Med Sch, WHO Collaborating Ctr Reference Res & Training Tr, Acad Ctr Travel Med & Vaccines, London NW3 2PF, EnglandUCL Royal Free & Univ Coll Med Sch, WHO Collaborating Ctr Reference Res & Training Tr, Acad Ctr Travel Med & Vaccines, London NW3 2PF, England