Amplification reaction was carried out with the following cycling conditions: primary denaturation for 3 min at 95 °C, followed by 30 cycles of 30 s at 94 °C, 1 min at 55 °C and 2 min of 72 °C, and a final extension of 10 min at 72 °C. The PCR product was run through a 1% agarose gel and purified using QIA Quick Gel Extraction Kit (Qiagen, Valencia, CA, U.S.).