@inproceedings{choi_kim_choi_kim_kim_2021, 
  title={Comparison of immuno-histochemical staining of programmed cell death ligand-1 (PD-L1) in placental site trophoblastic tumor and epithelioid trophoblastic tumor using 22C3, SP263, and SP142}, 
  DOI={10.3802/jgo.2021.32.s1.omi2}, 
  publisher={Asian Society of Gynecologic Oncology; Korean Society of Gynecologic Oncology; Japan Society of Gynecologic Oncology}, 
  author={Choi, Hyun Jin and Kim, Hyun Soo and Choi, Min-Chul and Kim, Mi-Kyung and Kim, Byung-Gie}, 
  year={2021}
  }