He also directly observed the work of Hippolyte Bernheim (1840–1919) in Nancy, Jean-Martin Charcot (1825–1893) at the Salpêtrière in Paris, Frederik Willem van Eeden (1860-1932) and Albert Willem van Renterghem (1846-1939) in Amsterdam, Ambroise-Auguste Liébeault (1923-1904) in Nancy and Otto Georg Wetterstrand (1845–1907) in Stockholm, at their respective clinics.
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He died on 16 January 1925 at the Miramare Palace Grand Hotel in Ospedaletti, Italy.
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