Missori, Paolo; Brunetto, Giacoma M.; Domenicucci, Maurizio (7 February 2012). "Origin of the Cannula for Tracheotomy During the Middle Ages and Renaissance". World Journal of Surgery. 36 (4): 928–934. doi:10.1007/s00268-012-1435-1. PMID22311135. S2CID3121262.
Missori, Paolo; Brunetto, Giacoma M.; Domenicucci, Maurizio (7 February 2012). "Origin of the Cannula for Tracheotomy During the Middle Ages and Renaissance". World Journal of Surgery. 36 (4): 928–934. doi:10.1007/s00268-012-1435-1. PMID22311135. S2CID3121262.
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Missori, Paolo; Brunetto, Giacoma M.; Domenicucci, Maurizio (7 February 2012). "Origin of the Cannula for Tracheotomy During the Middle Ages and Renaissance". World Journal of Surgery. 36 (4): 928–934. doi:10.1007/s00268-012-1435-1. PMID22311135. S2CID3121262.