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List of authors.Matteo Gelardi, M.D., and Michele Cassano, M.D.

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In a laboratory setting, a sample of nasal mucus was viewed under phase-contrast microscopy at high magnification. A ferning pattern was observed.

Matteo Gelardi, M.D.
Michele Cassano, M.D.
University of Foggia, Foggia, Italy
[email protected]

This article was published on June 12, 2021, at NEJM.org.

June 17, 2021
N Engl J Med 2021; 384:2331
DOI: 10.1056/NEJMicm2034441