Boris Johnson says that although he is likely to run for Parliament in next year's general election, he still intends to serve out his term as Mayor of London until its end in 2016.
Mr Johnson made the remarks at a speech in London this morning where he said he would "in all probability" try to run for Parliament next year.
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Mr Kim has made two recent visits to China.
The study looked at the development of 422 children over the course of eight years.
The president said they will come into force if China refuses to change its practices.