@misc{893,
  author = {RL Atmar and AR Opekun and MA Gilger and EK Estes},
  title = { Norwalk virus shedding after experimental human infection},
  year = {2008},
  url = {https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2609865/},
  language = {eng},
}