Initial placement of TEE probe by observing the position of esophageal opening in advance on improving the success rate of initial placement of TEE probe by observing the position of esophageal opening: a randomized controlled study. - Liu, Gai-Jiao; Xiao, Li; Yang, Han; Liang, Jing; Yang, Xin-Ping; Liu, Zhi-Heng; Chen, Yu; Wang, Xiao-E (Journal of Cardiothoracic Surgery, 2025)