@article{nakama_1986, 
  title={Varicose veins of the lower extremities - The study of surgical treatment and prognosis.}, 
  volume={15}, 
  DOI={10.4326/jjcvs.15.614}, 
  publisher={The Japanese Society for Cardiovascular Surgery}, 
  author={Nakama}, 
  year={1986}
  }