336LETTERS EID use and normal 7-day PFIs first emerged in the 50-100 µg pill era! Indeed, in the Mayo Clinic-based collected series, 7 16/25 women who, despite allegedly good pill-taking, conceived on enzyme-inducers were taking 50 µg pills; and the remaining nine were taking 100 µg pills (with mestranol)! Please, may we have our tricycle back?
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