Jean N., French surgeon, 1814-1875. See: Demarquay sign.
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Demarquay G, Royet JP Mick G, Ryvlin P Olfactory hypersensitivity in migraineurs: a H (2) (15) O-PET study.
Bensidhoum M, Chapel A, Francois S, Demarquay C, Mazurier C, Fouillard L, et al.
Some classical workers in the nineteenth century who worked on it include Demarquay, who first discovered and described the embroyonic form in 1863 in Paris.