Nile Ranger was released by Newcastle in March and is yet to be signed by a new club.
He played a part in the Magpies winning the Championship in 2009-10 but struggled to win a permanent place in the first team once the club was established back in the Premier League.
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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.