In November 2007, Kelvin Li Kwok-yin (), born on 30 November on 1976 at Tsan Yuk Hospital, was at the centre of Hong Kong's first "baby mix-up case". Mr. Li's sister, a student in nursing, learned that it would have been biologically impossible for their mother of blood type O to give birth to her brother of blood type AB positive. Lee and his parents took DNA tests that confirmed these results of mismatched DNA with his "parents", Lui Fung-ha and Li Wai-keung.