Please answer the following question: What type of details about knud aage nielsen  can be gathered from the following bio?  Bio: knud aage nielsen -lrb- born 1937 -rrb- is a retired male badminton player from denmark . with a singles game that featured consistency and excellent mobility , nielsen played at a high international level from the late 1950s through the mid 1960s . in 1964 he won men 's singles at the all england open badminton championships , then considered the unofficial world badminton championships , narrowly defeating fellow dane henning borch in the final . he played thomas cup -lrb- men 's international team competition -rrb- singles for denmark in the ' 60 -- '61 and ' 63 -- '64 campaigns , scoring denmark 's only singles victory in its surprising '64 challenge round loss to indonesia .
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