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The EEF was launched in 2015 on the personal initiative of Putin. Xi's attendance is the first by a Chinese head of state at the forum.

"The Lancet is very strict about publishing articles, and the review cycle often lasts for months, sometimes even more than a year. It took less than a month for the journal to publish the clinical trial of the stent, and all five peer review experts gave positive feedback," Chang said.

For his part, Vucic said Serbia appreciates China's help and is willing to become a truehearted partner of China and continually support each other to consolidate their friendship.

He said countries should address global challenges by enhancing cooperation and practicing multilateralism.

Both sides hailed the new progress on exploring high-level opening up and innovation and promoting green and sustainable development and connectivity in the three major cooperative projects, namely the Suzhou Industrial Park, the Tianjin Eco-City and the Chongqing Demonstration Initiative on Strategic Connectivity, reaffirming both governments' support for the three projects and the Sino-Singapore Guangzhou Knowledge City.