An EastEnders spokesperson said they are "deeply saddened" to hear that actress Anna Wing has passed away.
They continued: "From the very first episode of EastEnders, Anna created one of the most iconic matriarchs in television history.
"Lou Beale is so entrenched in EastEnders history & without Anna, the Beale family would never have been the focal point it is today.
"Anna will be remembered fondly by everyone at EastEnders and our deepest sympathies are extended to her family and friends”.
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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.