Effect of Mindfulness Training on the Clinical Pregnancy Rate in Women Undergoing Frozen Embryo Transfer: Study Protocol for a Single-Center, Open-Label, Randomized Controlled Trial. - Yi, Songping; Zhang, Junyan; Li, Aimin; Zhou, Na; Li, Jing; Cao, Ruxue; Gao, Yuan; Liu, Xiaolei; Zhai, Jiajia (International Journal of Women's Health, 2026)