Mervat Mohamed Harira. "Combined Letrozole and Clomiphene versus Letrozole with low dose gonadotropin protocol for ovulation induction in infertile clomiphene-resistant women with polycystic ovary syndrome: Comparative study". Evidence Based Women's Health Journal, 8, 4, 2018, 266-272. doi: 10.21608/ebwhj.2018.20068