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[975] Heller, loc. cit.
[976] Still, Brit. Med. Journ., 1899.
[977] Dornblüth, loc. cit.
[978] Rahn, Münch. med. Wochenschr., 1905.
[979] Senger, Berl. klin. Wochenschr., 1907, xxxviii.
[980] Seifert, Deutsch. med. Zeitg., 1885.
[981] Esser, Schweiz. Korrespondenzbl., 1893.
[982] Jurasz, Heymann’s “Handb. d. Laryng. u. Rhinol.,” 1899, ii.
[983] Cortial, Union méd., 1886.