Department of Breast Surgery;
Qingdao Central Hospital Affiliated to Qingdao University;
Qingdao 266042;
China;
Qingdao Central Hospital Affiliated to Qingdao University;
Qingdao 266003;
China;
Linyi Central Hospital;
Linyi 276400;
China;
intestinal flora; estrogen; breast fibroadenoma; 16S ribosomal RNA; high-throughput sequencing;