机构:
Univ London Imperial Coll Sci Technol & Med, St Marys Hosp, Dept Infect Dis Epidemiol, London W2 1PG, England
Christian Med Coll & Hosp, Div Gastrointestinal Sci, Wellcome Trust Res Lab, Vellore, Tamil Nadu, IndiaUniv London Imperial Coll Sci Technol & Med, St Marys Hosp, Dept Infect Dis Epidemiol, London W2 1PG, England