[Dr.Vad]

В Канаде напр. после 3-х:

Women with a history of three or more second-trimester pregnancy losses or extreme premature deliveries, in whom no specific cause other than potential cervical insufficiency is identified, should be offered elective cerclage at 12 to 14 weeks of gestation. [Ссылки доступны только зарегистрированным пользователям ]