@misc{indiciae4a5252a1d1d2,
  title = {Upper gastrointestinal tumors.},
  author = {Keisuke Aiba and Makoto Ogawa},
  year = {2003},
  doi = {10.1016/s0921-4410(03)21023-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/15338760/},
  note = {Source identifier: 15338760}
}