Different screening frequencies of carbapenem-resistant Enterobacteriaceae in patients undergoing hematopoietic stem cell transplantation: which one is better? oleh Ting-Ting Yang, Xue-Ping Luo, Qing Yang, Hong-Chao Chen, Yi Luo, Yan-Min Zhao, Yi-Shan Ye, Xiao-Yu Lai, Jian Yu, Ya-Min Tan, Guo-Qing Wei, He Huang, Ji-Min Shi