Popularity on Google’s first page

Here is some insight on which websites show up when you search for the names of a random number of doctors in the US in Google

The Top 10

healthgrades.com
vitals.com
yelp.com
manta.com
ucomparehealthcare.com
local.yahoo.com
yellowpages.com
angieslist.com
doctor.webmd.com
wellness.com