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“Vietnam is pragmatic and they’re flexible,” said Rich McClellan, a strategic advisor on policy and economic strategy in Vietnam.

Another member of the research team, Alyce McClellan, from Cambridge University added that the results emphasised "the importance of fundamental brain pathways in controlling appetite and body weight".

The rare manuscript - dated between 1830 and 1835 - was discovered by curator Robinson McClellan while he was cataloguing new collections.

The waltz has minor errors in rhythm and notation but Mr McClellan said he is sure that Chopin is behind it.

The golf course sits near the Sacramento McClellan Airport.