IMAM, A. M. A. .; SABRA, A. M. A.; NASR, A. M. A. A.; FETIH, A. N. H. Efficacy of combined letrozole-metformin in comparison with letrozole only in clomiphene resistant infertile women with polycystic ovarian syndrome: a randomized controlled trial. International journal of health sciences, [S. l.], v. 6, n. S7, p. 1062–1071, 2022. DOI: 10.53730/ijhs.v6nS7.11516. Disponível em: https://sciencescholar.us/journal/index.php/ijhs/article/view/11516. Acesso em: 1 may. 2026.