“…Prior exposure was unclear or not reported in 31 cases (23.5%). Of those with prior exposure to exogenous progesterone, 52 patients did so through oral contraceptive pills, 4 patients through intrauterine devices, 65,101,106,110 3 patients through injectables, 3,49,54 1 through topical progesterone acetate, 5 and 1 through a vaginal progesterone suppository 78 . The method of exogenous progesterone exposure was not specified in 8 cases 3,10,34,42,44,63,113 …”