✔ 最佳答案
I have helped you to search for a long while online.
The most reliable website is:
http://www.doctorlist.com.hk/index.php
It contains all registered doctors in Hong Kong. Nevertheless, no such Dr. Kong Kwok Leung is available. I note his old office was in 12/F, Tak Shing Building but now his office was moved.
The only possibility is he has retired or he has migrated or he has moved to other countries for continuation of his work. Last time I helped one person searching the doctor and finally, she is now working in one mainland hospital!
Right now, you can make use of the website provided above to find an alternative instead. This is my candid suggestion to solve the problem.
Hope I can help you.
參考: Mathematics Teacher Mr. Ip