An inherent principle of publication is that others should be able to replicate and build upon the authors' published claims. A condition of publication in a Nature Portfolio journal is that authors ...

1 Department of Epidemiology, Harvard School of Public Health, Boston, USA 2 Departments of Epidemiology and Biostatistics, Harvard School of Public Health Correspondence to: Dr M A Hernán Department ...

When the pandemic started, it was not known which vaccines would be successful or when they would be available. Experts therefore advised Canada to secure many different types of vaccines. To secure ...