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Periodic respiration during sleep at the Regina Margherita Hut (4554 m or 14,941 ft)

The subject was Angelo Mosso's brother, Ugolino Mosso (1854-1909), a lecturer in pharmacology in Turin. (Source: Mosso A. Life of man on the high Alps. Kiesow EL, trans. London: T Fisher Unwin, 1898.)