A 6.8-magnitude earthquake has hit south-west Pakistan, in a region where at least 359 people died in a quake earlier this week.
The US Geological Survey said the quake struck approximately 155 miles north of the port city of Karachi.
There were no immediate reports of casualties or damage.
More top news
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.