The original version of the article [1] unfortunately contained three mistakes. The statement for Hardeep Singh regarding VA funding was incorrectly listed in the ‘Competing Interests’ section. The correct location for this text is the ‘Acknowledgements’ section. The ‘Competing Interests’ section was also missing the text “All authors confirm that they have no competing interests”. Finally, the formatting for citation 7 was incorrectly displayed as Hardeep S. The correct formatting is Singh H.