Intrauterine levonorgestrel delivered by a frameless system, combined with systemic estrogen: acceptability and endometrial safety after 3 years of use in peri- and postmenopausal women.

Intrauterine levonorgestrel delivered by a frameless system, combined with systemic estrogen: acceptability and endometrial safety after 3 years of use in peri- and postmenopausal women.