@article{WojtalewiczVierbaumSchellenbergetal.2021,
  author    = {Nathalie Wojtalewicz and Laura Vierbaum and Ingo Schellenberg and Klaus-Peter Hunfeld},
  title     = {Evaluation of INSTAND e.V.'s external proficiency testing program for tetanus and diphtheria antitoxin detection: Lessons for assessing levels of immunoprotection},
  journal   = {International Journal of Infectious Diseases},
  volume    = {104},
  pages     = {85 -- 91},
  doi       = {10.1016/j.ijid.2020.12.046},
  year      = {2021},
}