A hypothesis on the aetiology of adenomyosis: is there an association between cumulative number of menstruations and severity of adenomyosis on ultrasound? - de Bock EJE; Verbeek C; Klinkenberg E; Twisk JWR; Burger NB; Juffermans LJM; Huirne JAF; de Leeuw RA (European journal of obstetrics & gynecology and reproductive biology: X, 2026)