 Complete the following phrase:  Berglund also won two medals at the ICF Canoe Sprint World Championships with a gold K-4 1000 m: 1948 and a silver K-2 1000 m: 1938. Note that the K-4 1000 m event was not part of the Summer Olympics until the 1964 games in Tokyo. It was considered an extraordinary event and was part of the International Canoe Federations 