You could also set Limits, you'll see the tab. They will allow you to just search for humans
instead of plus animals, men and not women, a certain age group, clinical trials, and publications done within the last two years etc. Also, this other site may help you, in your search, but you will have to register prior to using it. http://clinicaloptions.com/hepatitis.aspx Here’s a little clip I grabbed off of pubmed..