“…The CC group were treated with the stair‐step protocol as follows: (i) CC (sanofi‐aventis US, Bridgewater, NJ, USA) was started at a dose of 50 mg/day from the fifth day of a spontaneous or progestin‐induced cycle for 5 days (D5–D9 of the treatment cycle); (ii) ultrasonography was done on D12–D14, and if no dominant follicle was seen, the dose was increased to 100 mg/day starting on the same day of the ultrasound and given for 5 days; (iii) ultrasonography was repeated 1 week after the first scan (D19–D21), and if no dominant follicle was seen, the dose was increased to 150 mg/day starting on the same day of the ultrasound and given for 5 days; (iv) a third and final scan was done 1 week after the second (D28), and if still no dominant follicle was seen, the treatment was labeled a failure (Fig. ).…”