Also sprach Landsteiner – Blood Group ‘O’ or Blood Group ‘NULL’

@article{Schmidt2001AlsoSL,
  title={Also sprach Landsteiner – Blood Group ‘O’ or Blood Group ‘NULL’},
  author={Paul Schmidt and Mathias Okroi},
  journal={Transfusion Medicine and Hemotherapy},
  year={2001},
  volume={28},
  pages={206 - 208}
}
Background: The designation for the universal donor blood group is the letter O in most countries, but there is preference for the use of NULL or 0, the numeral for zero, in some European countries. The matter was of little importance before the use of electronic communication for which the two are keyed differently. Methods: The assignment of identity was traced in the literature and in committee reports and correspondence from the first use by Landsteiner of the letter C, to an earlier… 

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