Who is the chief immigration officer of the Immigration Bureau?

Does the subject want to ask, "There is one item in the medical examination of Canadian immigrants that needs to be re-examined, but can it be re-examined in China when returning home?" I can't. According to the information of official website, whether the National Immigration Bureau and the Canadian Immigration Bureau pass the physical examination is judged by the physical examination audit team, and the applicant needs to go to the reexamination institution designated by Canada for reexamination within the reexamination notice time. The National Immigration Bureau was established according to the institutional reform plan of the State Council approved by the First Session of the 13th National People's Congress, and is managed by People's Republic of China (PRC) and the Ministry of Public Security.