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Contributors PO and TH designed the study. TP was responsible for the chlamydia testing. TH led the analysis, with input from PO. TH wrote the first draft of the manuscript, and all authors contributed to and approved the final version.
Competing interests None.
Patient consent Obtained.
Ethics approval Bromley REC: 12/LO/0855.
Provenance and peer review Not commissioned; internally peer reviewed.
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