Hi. I'm online and happy to answer your question today.
Westchester County Medical Center is one of the teaching hospitals for New York Medical College, one of the top Medical Schools in the country. I am sure that he is getting sub specialty there.
This being said, if it is possible for him to travel out of State, I can give you information on the top GI/Liver doctor in the Country. He is located in Houston, Texas.
I see that you are offline. I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)
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Let me know if you have further questions.