Handwashing: ring-wearing and number of microorganisms.

@article{Jacobson1985HandwashingRA,
  title={Handwashing: ring-wearing and number of microorganisms.},
  author={Gordon Jacobson and Joan E Thiele and J H McCune and Lindi Farrell},
  journal={Nursing research},
  year={1985},
  volume={34 3},
  pages={186-8}
}