I emailed this to most Wharton PhD health care students, but thought this was worthy posting here for others. There are two new commands in stata that allow you to link with google maps and turn addresses into latitudes and longitudes as well as calculate distances and travel times.
And install the two commands, geocode and travel time
What do these two commands do?
First geocode can take addresses, in many sorts of formats, and then return the latitude and longitude based on Google Geocoding. Because it is using Google the matches can be pretty good, there is flexibility on the addresses, and geocode can also return the geoscore which gives you an estimate of accuracy of the match.
Once you have the latitudes and longitudes you can use the traveltime command to find the distance between points AND the travel time. What is really cool is that it can be driving, walking, or public transport time.
These are probably really useful for a lot of hospital based studies, and other things. Either way check out the help documentation to learn more.
All the best!!! - Hat tip to Mike Harhay who put me onto this.