I have seen Dr. Tang since 2004. He is very professional. I have a heart murmor and I have to take antibotic every time before I see him. For the recent visit, he told me that according to the American Heart Association, it is no longer require to take the antibotic like my case. He advised me to check with my family doctor and I did. My family doctor said he is right, so I don't have to take antibotic anymore. Thanks for his advise.