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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Benjamin Eaton analyzed the data, wrote the paper, prepared figures and/or tables.

Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

QuintilesIMS Scientific Review Committee

Data Deposition

The following information was supplied regarding data availability:

For ethical reasons the raw data used in this project cannot be hosted publicly due to the possibility of the re-identification of patients from their health records.

Funding

The authors received no funding for this work.


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