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The 1906 Intercalated Games (or 1906 Summer Olympics) were discounted ex post facto by the IOC. All medals awarded during these games have not since been counted officially on total medal counts.
These games were cancelled due to the World Wars. The 1916 Summer Olympics were cancelled due to the onset of WWI; both the Summer and Winter Olympics of 1940 and 1944 were cancelled due to WWII.