About the Authors

Clarence C Tam


Affiliations Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore, Faculty of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, United Kingdom

Sarah J O’Brien

Affiliations NIHR Health Protection Research Unit in Gastrointestinal Infections, University of Liverpool, Liverpool, United Kingdom, Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CCT SJO'B. Analyzed the data: CCT. Wrote the paper: CCT SJO'B.