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Contributors RAA drafted the manuscript, and both authors edited it and approved the final version.
Funding The authors’ work in this field is support by a grant from the Medical Research Council (MR/N022556/1) to the MRC Centre for Reproductive Health.
Competing interests RAA reports grants and personal fees from Roche Diagnostics, personal fees from Ferring Pharmaceuticals, personal fees from IBSA and personal fees from Merck Serono, outside the submitted work.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Patient consent for publication Not required.
Provenance and peer review Commissioned; internally peer reviewed.
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