China issued a formal notice to the World Health Organization (WHO) on Wednesday, in which it defended the quality of its food exports, the Wall Street Journal reported. "The Chinese government has consistently placed a high priority on the work of food safety," the notice read, repeating previous assertions that 99% of China's food exports are safe. The notice also said that Beijing is willing to increase information exchanges with other countries and organizations on the issue. Meanwhile, Zheng Shangjin, former head of Zhejiang province's food and drug bureau, was sentenced to four years in prison for taking bribes. Zheng had ties to Zheng Xiaoyu, the former head of the State Food and Drug Administration who executed in July for taking bribes to approve substandard medicines. State media said Zheng Shangjin had admitted to receiving US$90,000 from Hainan Kangliyuan Group for assistance in getting drugs approved.