Footnotes

• Contributors All authors contributed to the original idea for the paper and the writing and revision of the manuscript. AFH performed the data analysis and wrote the original draft.

• Funding Supported by the Lynne Stephens Award from Boston Medical Center and the Tynan Fellowship, Connors Center for Women’s Health, Brigham and Women’s Hospital.

• Competing interests None declared.

• Provenance and peer review Not commissioned; internally peer reviewed.

• Patient consent for publication Not required.