Emerging trends and hotspots in animal experimental research on lung transplantation from 2004 to 2023: a bibliometric analysis - Xie, Chen; Piao, Mingyi; Zhou, Liwang; Tao, Xinchen; Yao, Yuanyuan; Jiang, Baochun; Wang, Xinqiang; Yan, Min (Journal of Thoracic Disease, 2025)